THE CORE CAST

The listing of the exact episode numbers they appear in aims to list all appearances with dialogue rather than simply credited appearances, but as the listing is still based principally on the actual credits, I'm sure there are still some mistakes. I'd also recommend cross checking with Bjorn's "Sun and Rain are Prisoners Too" site which was complied independantly of mine from the Swedish broadcast runs and has often proved to be more reliable. Visit the LINKS page for the address (see above).

From EPISODE 1
Meg Jackson/Morris ~ Elspeth Ballantyne	669 episodes TOP 25	(1) to (75) * (77) to (165) * (167) to (218) * (221) to (274) * (277) to (316) * (319) to (398) * (401) to (458) * (461) to (514) * (519) to (598) * (601) to (652) * (654) to (658) * (663) to (692)
Erica Davidson ~ Patsy King	351 episodes TOP 25	(1) to (63) * (65) to (204) * (206) to (232) * (239) to (281) * (283) to (291) * (293) to (297) * (299) to (312) * (314) to (327) * (333) to (343) * (345) to (360) * (424) to (425) * (426) to (428) * (451) to (454)
Doreen Anderson/Burns ~ Collette Mann	286 episodes TOP 25	(1) to (31) * (33) to (46) * (49) * (55) to (76) * (78) to (79) * (89) to (246) * (253) to (261) * (268) to (269) * (273) to (304) * (358) to (360) * (435) to (446)
Lizzie Birdsworth ~ Sheila Florance	403 episodes TOP 25	(1) to (3) * (5) to (31) * (33) to (72) * (74) to (78) * (81) to (206) * (211) to (308) * (310) to (322) * (328) to (418)
Bea Smith ~ Val Lehman	375 episodes TOP 25	(1)-(56) * (58) * (61)-(126) * (129)-(142) * (147)-(150) * (153)-(262) * (267)-(270) * (273)-(316) * (321)-(352) * (357)-(400)
Vera Bennett ~ Fiona Spence	222 episodes TOP 25	(1)-(174) * (177)-(224)
Mum Brooks ~ Mary Ward	33 episodes	(1)-(16) * (30)-(33) * (61)-(67) * (199)-(204)
Greg Miller ~ Barry Quin	85 episodes	(1)-(33) * (36)-(38) * (40)-(54) * (56)-(71) * (73)-(86) * (107)-(110)
Karen Travers ~ Peita Toppano	79 episodes	(1)-(34) * (36)-(80)
Lynn Warner ~ Kerry Armstrong	44 episodes	(1)-(44)
Franky Doyle ~ Carol Burns	20 episodes	(1)-(20)
From EPISODE 3
Chrissie Latham ~ Amanda Muggleton	107 episodes TOP 25	(3)-(4) * (65)-(77) * (83)-(84) * (86)-(93) * (95)-(103) * (151)-(157) * (167) * (187)-(197) * (285)-(338)
From EPISODE 8
Det Insp Grace ~ Terry Gill	53 episodes	(8) * (14) * (30) * (45) * (47) to (48) * (142) * (144) to (147) * (153) to (154) * (215) to (218) * (221) * (223) to (224) * (243) to (246) * (255) to (256) * (263) to (264) * (297) to (300) * (361) * (364) * (487) * (499) * (521) * (526) * (528) to (530) * (532) * (548) * (550) to (553) * (555) * (565) to (566) * (568) * (634) to (635)
From EPISODE 14
Jean Vernon ~ Christine Amor	29 episodes	(14)-(32) * (47)-(56)
From EPISODE 15
Monica Ferguson ~ Lesley Baker	36 episodes	(15)-(18) * (29)-(60)
Steve Wilson ~ Jim Smillie	27 episodes	(15)-(34) * (36)-(42)
From EPISODE 28
Dr Weissman ~ Bryon Williams	27 episodes	(28) * (64) * (71) * (136) * (138) * (140) * (157) * (164) * (167) * (201) * (203) * (311) to (314) * (380) to (382) * (384) * (434) * (555) * (562) to (563) * (582) * (584) to (585) * (589)
From EPISODE 29
Joyce Barry ~ Joy Westmore Credited as "Officer Barry" up to (470)	254 episodes TOP 25	(29) * (43) * (63) to (66) * (69) * (74) to (75) * (75) * (90) * (113) * (121) * (125) * (127) to (128) * (130) to (131) * (133) * (157) * (159) to (160) * (174) * (177) * (195) to (196) * (223) * (225) * (227) to (229) * (231) to (233) * (237) * (239) * (241) * (243) * (245) * (249) * (252) * (260) * (262) * (275) * (283) * (285) * (297) * (303) * (350) * (358) * (362) * (365) * (370) * (386) * (388) * (390) to (391) * (396) * (401) to (402) * (405) to (407) * (410) * (417) to (419) * (434) to (435) * (455) to (459) * (461) * (465) to (468) * (470) * (471) * (473) to (483) * (485) * (488) * (491) * (494) to (495) * (498) to (510) * (512) to (514) * (517) to (524) * (526) to (540) * (542) to (572) * (574) to (575) * (577) to (580) * (582) to (583) * (585) to (587) * (589) to (590) * (592) to (596) * (599) to (601) * (603) to (613) * (615) to (619) * (621) to (625) * (627) to (628) * (636) to (641) * (643) * (645) to (651) * (654) to (655) * (657) to (660) * (662) to (663) * (665) to (666) * (668) * (670) to (675) * (677) to (681) * (683) to (686) * (689) to (690) * (692)
From EPISODE 30
Kathleen Leach ~ Penny Stewart	28 episodes	(30) * (34) * (46) * (56)-(59) * (63)-(66) * (74)-(75) * (79)-(84) * (87)-(89) * (143)-(147) * (149)
Noeline Bourke ~ Jude Kuring	27 episodes	(30)-(37) * (50)-(56) * (121)-(132)
From EPISODE 40
Jim Fletcher ~ Gerard Maguire	208 episodes TOP 25	(40)-(58) * (63)-(75) * (77)-(86) * (89)-(240) * (243)-(256)
From EPISODE 48
Colleen Powell ~ Judith McGrath Credited as "Officer Powell" up to (348)	263 episodes TOP 25	(48) * (65) * (71) * (76) to (77) * (80) * (111) * (121) * (133) * (155) * (161) * (165) to (166) * (168) to (169) * (174) * (193) to (200) * (202) to (203) * (211) to (213) * (223) to (456)
From EPISODE 49
Phyllis Hunt ~ Reylene Pearce	137 episodes TOP 25	(49) * (54) * (56) * (63) * (66) * (70) * (75) * (84) to (85) * (108) * (111) * (115) * (121) * (123) * (125) * (134) * (136) * (141) * (143) * (148) to (149) * (159) * (163) * (165) to (166) * (172) * (178) * (195) * (198) to (200) * (205) * (207) * (222) * (233) * (240) * (242) * (244) * (246) to (247) * (249) * (271) * (287) to (288) * (294) * (317) * (320) * (350) to (354) * (359) * (361) to (366) * (368) to (373) * (377) to (381) * (383) * (388) * (390) to (398) * (400) to (408) * (411) to (421) * (424) to (444) * (446) to (460)
From EPISODE 61
Ted Douglas ~ Ian Smith	51 episodes	(61) * (66) * (115) * (117) * (135) * (138) * (140) * (159) * (161) * (166) * (168)-(169) * (189) * (196)-(197) * (219) * (231)-(232) * (249) * (251) * (258) * (279) * (285) * (296)-(297) * (317) * (329) * (332) * (339) * (351) * (353)-(354) * (360)-(361) * (364)-(365) * (373)-(375) * (380)-(382)
From EPISODE 63
Roslyn Coulson ~ Sigrid Thornton	30 episodes	(63)-(92)
From EPISODE 65
Pat O'Connell ~ Monica Maughan	40 episodes	(65)-(88) * (95)-(110)
From EPISODE 85
Paul Reid ~ George Mallaby	43 episodes	(85)-(110) * (115)-(131)
From EPISODE 89
Kevin Burns ~ Ian Gilmour	22 episodes	(89) to (102) * (115) to (118) * (120) * (137) to (139)
Caroline Simpson ~ Rosalind Speirs	26 episodes	(89)-(114)
From EPISODE 90
Sharon Gilmour ~ Margot Knight	27 episodes	(90)-(116)
From EPISODE 91
Judy Bryant ~ Betty Bobbitt	429 episodes TOP 25	(91) * (93) to (246) * (251) to (308) * (313) to (400) * (403) to (514) * (519) to (534)
From EPISODE 92
Margo Gaffney ~ Jane Clifton	107 episodes TOP 25	(92) to (93) * (97) * (99) * (102) * (121) * (123) to (133) * (135) to (142) * (147) * (161) to (168) * (179) to (185) * (198) to (208) * (247) to (248) * (257) * (260) * (264) to (265) * (267) to (269) * (271) to (274) * (280) to (284) * (307) to (335) * (442) to (449)
From EPISODE 106
Mouse ~ Jentah Sobott	57 episodes	(106) * (108) * (111) * (114) * (118) * (121) * (125) * (131)-(132) * (141) * (150)-(151) * (155) * (157) * (160) * (162) * (164)-(167) * (170)-(171) * (182) * (185) * (191) * (193) * (195) * (224) * (226)-(230) * (235) * (244) * (246)-(247) * (250)-(251) * (255) * (260) * (263) * (265)-(268) * (270) * (299) * (301)-(304) * (321)-(326)
From EPISODE 118
Helen Smart ~ Caroline Gillmer	77 episodes	(118) to (120) * (123) to (124) * (161) to (165) * (171) to (172) * (272) to (274) * (279) to (281) * (283) to (286) * (310) to (314) * (317) to (318) * (341) to (344) * (349) to (356) * (381) to (396) * (419) to (424) * (426) to (435) * (437) to (438) * (440) to (441)
From EPISODE 141
Tracey Morris ~ Sue Devine	21 episodes	(141) to (158) * (165) * (197) to (198)
From EPISODE 142
Hazel Kent ~ Belinda Davey	63 episodes	(142) * (144) * (165)-(166) * (168)-(169) * (173) * (177) * (182)-(183) * (186) * (188)-(190) * (193) * (196) * (198) * (206)-(208) * (210) * (220) * (229) * (233) * (235) * (237)-(239) * (241) * (243) * (246)-(247) * (249) * (252) * (254) * (258)-(259) * (261) * (263)-(268) * (330)-(332) * (335)-(338) * (343)-(346) * (393)-(400)
From EPISODE 143
Bob Morris ~ Anthony Hawkins	34 episodes	(143) to (158) * (163) to (165) * (168) * (181) to (182) * (187) to (190) * (201) * (204) to (208) * (259) to (260)
From EPISODE 151
Officer Bailey ~ Maureen Edwards	28 episodes	(151) * (152) * (208) * (219) * (242) * (243) * (244) * (250) * (266) * (267) * (277) * (280) * (281) * (282) * (326) * (327) * (330) * (419) * (420) * (431) * (460) * (478) * (498) * (500) * (502) * (509) * (623) * (629)
From EPISODE 154
Myra Desmond ~ Anne Phelan	124 episodes TOP 25	(154) * (158) to (159) * (223) to (224) * (273) to (274) * (429) to (459) * (461) to (465) * (467) to (510) * (515) to (538) * (540) to (552)
From EPISODE 167
Wally Wallace ~ Alan Hopgood	75 episodes	(167) to (170) * (259) to (262) * (269) to (270) * (291) to (292) * (369) to (420) * (425) to (428) * (459) to (460) * (462) to (466)
From EPISODE 171
David Andrews ~ Serge Lazareff	24 episodes	(171) to (194)
From EPISODE 197
Marie Winter ~ Maggie Millar	39 episodes	(197) to (198) * (245) to (269) * (461) to (472)
From EPISODE 199
Terry Harrison ~ Brian Hannan	25 episodes	(199)-(223)
From EPISODE 232
Janet Conway ~ Kate Sheil	43 episodes	(232)-(274)
From EPISODE 235
Kate Peterson ~ Olivia Hamnett	39 episodes	(235)-(273)
Sandy Edwards ~ Louise Le Nay	30 episodes	(235)-(264)
From EPISODE 246
Steve Fawkner ~ Wayne Jarratt	71 episodes	(245)-(299) * (301)-(316)
From EPISODE 260
Susie Driscoll ~ Jacqui Gordon	43 episodes	(260)-(302)
From EPISODE 285
Faye Quinn ~ Anne Lucas	22 episodes	(285) * (287) to (290) * (305) to (306) * (311) * (313) * (340) to (352)
From EPISODE 287
Joan Ferguson ~ Maggie Kirkpatrick	389 episodes TOP 25	(287) to (327) * (333) to (430) * (435) to (488) * (491) to (522) * (525) to (616) * (618) to (639) * (641) to (678) * (681) to (692)
From EPISODE 297
Maxine Daniels ~ Lisa Crittenden	91 episodes TOP 25	(297)-(299) * (304)-(320) * (322)-(392)
From EPISODE 300
Barbara Fields ~ Susan Guerin	26 episodes	(300)-(317) * (319)-(326)
From EPISODE 304
Paddy Lawson ~ Ann Hruby	37 episodes	(304)-(340)
From EPISODE 306
Tony Berman ~ Alan David Lee	21 episodes	(306)-(313) * (316)-(319) * (321)-(329)
From EPISODE 331
Nola McKenzie ~ Carole Skinner Credited as "Jean" (333)-(336)	40 episodes	(331)-(370)
From EPISODE 364
Ann Reynolds ~ Gerda Nicolson	317 episodes TOP 25	(364) to (420) * (422) to (438) * (440) to (506) * (511) to (590) * (593) to (672) * (677) to (692)
From EPISODE 373
Frances Harvey ~ Wanda Davidson	42 episodes	(373) * (376) * (384) to (385) * (395) * (400) * (402) to (406) * (411) to (412) * (425) * (427) * (436) * (443) * (448) to (449) * (453) * (464) * (466) to (467) * (469) * (474) to (476) * (479) * (481) * (483) * (487) * (490) * (492) to (493) * (495) * (499) to (501) * (505) to (506) * (512) * (525)
From EPISODE 377
Pixie Mason ~ Judy McBurney	96 episodes TOP 25	(377) to (422) * (424) to (427) * (442) to (460) * (484) to (510)
From EPISODE 383
Scott Collins, Dr ~ Tim Elston	32 episodes	(383) to (401) * (403) to (407) * (409) to (410) * (412) to (415) * (417) to (418)
Petra Roberts ~ Penny Maegraith	25 episodes	(383) to (407)
From EPISODE 394
Sonia Stevens ~ Tina Bursill	54 episodes	(394) to (447)
From EPISODE 401
Cass Parker ~ Babs McMillan	60 episodes	(401) to (460)
From EPISODE 405
Bobbie Mitchell ~ Maxine Klibingaitis	108 episodes TOP 25	(405) to (460) * (462) to (493) * (495) to (513) * (533)
Minnie Donovan ~ Wendy Playfair	33 episodes	(405) to (437)
From EPISODE 421
Rick Manning ~ Andy Anderson	38 episodes	(421) to (458)
From EPISODE 422
Reb Kean ~ Janet Andrewartha	94 episodes TOP 25	(422) to (474) * (477) to (490) * (492) to (506) * (577) to (582) * (584) to (589)
From EPISODE 425
Stanley Dobson ~ Brian James	22 episodes	(425) to (433) * (483) to (494) * (513)
From EPISODE 448
Alice Jenkins ~ Lois Collinder	168 episodes TOP 25	(448) to (449) * (451) to (452) * (466) to (467) * (469) * (474) to (476) * (478) * (480) to (481) * (483) * (489) * (492) * (494) to (495) * (497) * (499) * (502) to (503) * (505) to (506) * (511) * (513) * (515) * (517) * (520) to (522) * (524) to (529) * (534) to (537) * (539) to (540) * (549) to (553) * (555) * (557) * (559) to (560) * (562) to (563) * (565) * (567) * (575) * (577) * (579) to (584) * (586) to (601) * (603) to (605) * (607) * (609) to (692)
From EPISODE 450
Rachel Milsom ~ Kim Trengove	22 episodes	(450) * (452) to (462) * (464) to (472)
From EPISODE 452
Lou Kelly ~ Louise Siversen	140 episodes TOP 25	(452) to (453) * (457) * (460) to (461) * (464) * (466) to (467) * (469) * (471) * (473) * (475) to (477) * (480) to (481) * (487) to (493) * (495) to (496) * (499) to (508) * (510) to (522) * (524) to (543) * (545) to (616)
From EPISODE 457
Dennis Cruickshank ~ Nigel Bradshaw	75 episodes	(457) to (482) * (511) to (546) * (548) to (560)
From EPISODE 461
Marlene Warren ~ Genevieve Lemon	74 episodes	(461) to (534)
Heather Rogers ~ Victoria Nicolls	23 episodes	(461) to (462) * (464) to (484)
From EPISODE 462
Shane Munroe ~ Robert Summers	26 episodes	(462) to (474) * (476) to (478) * (480) to (481) * (508) * (512) to (515) * (518) * (526) to (527)
Dot Farrar ~ Alethea McGrath	25 episodes	(462) to (486)
From EPISODE 473
Officer Pat Slattery ~ Dorothy Cutts	76 episodes	(473)-(477), (486), (488), (492)-(493), (495)-(497), (499)-(501), (503)-(505), (511), (514)-(515), (517)-(518), (525), (533)-(534), (537)-(539), (546)-(547), (556), (558)-(559), (563)-(566), (569), (571), (575), (577), (582)-(583), (586)-(599), (606)-(607), (609), (611), (615)-(616), (624), (628), (631), (633), (653), (674), (675), (677), (685)-(687), (690)
From EPISODE 475
Phil Cleary ~ Steve Kuhn	22 episodes	(475) to (477) * (479) to (483) * (485) to (498)
From EPISODE 495
Sam Greenway ~ Robyn Gibbes	24 episodes	(495) to (500) * (502) to (509) * (511) to (520)
From EPISODE 499
Matt Delany ~ Peter Bensley	34 episodes	(499) to (500) * (502) to (533) *
From EPISODE 501
Geoff Macrae ~ Les Dayman	34 episodes	(500) * (502) to (504) * (505) to (510) * (512) to (534) * (556)
Frank Burke ~ Trevor Kent	33 episodes	(500) * (502) to (508) * (510) to (524) * (526) to (533) * (554) to (555)
From EPISODE 510
Lexie Patterson ~ Pepe Trevor	139 episodes TOP 25	(509) to (544) * (546) to (600) * (602) to (639) * (641) to (650)
From EPISODE 514
Ettie Parslow ~ Lois Ramsay	46 episodes	(514) to (528) * (530) * (539) to (560) * (593) to (600)
From EPISODE 523
Mervin Pringle ~ Ernie Bourne	76 episodes	(523) to (524) * (526) * (531) to (532) * (535) to (538) * (540) * (544) to (546) * (553) to (554) * (557) to (562) * (567) to (572) * (575) * (577) to (580) * (582) * (586) to (587) * (589) to (590) * (593) to (596) * (598) to (601) * (605) to (608) * (611) to (612) * (614) to (619) * (621) to (622) * (625) * (636) to (639) * (644) * (649) to (652) * (661) to (662) * (674) * (677) to (678) * (690) to (691)
From EPISODE 537
Willie Beecham ~ Kirsty Child	52 episodes	(537) to (587) * (682)
Julie Egbert ~ Jackie Woodburne	87 episodes TOP 25	(537) to (540) * (542) to (544) * (546) to (547) * (550) to (567) * (569) to (628)
Daphne Graham ~ Debra Lawrance	52 episodes	(537) to (588)
Nora Flynn ~ Sonja Tallis	51 episodes	(537) to (545) * (547) to (588
May Collins ~ Billie Hammerberg	51 episodes	(537) to (587)
From EPISODE 540
Pippa Reynolds ~ Christine Harris	34 episodes	(540) to (542) * (544) to (550) * (561) to (572) * (574) to (577) * (580) to (582) * (584) to (585) * (587) to (588) * (604)
Terri Malone ~ Margot Knight	24 episodes	(540) to (543) * (546) to (547) * (549) * (555) * (559) to (568) * (570) * (572) to (576)
Jenny Hartley ~ Jenny Lovell	44 episodes	(540) to (542) * (544) * (546) to (562) * (564) to (565) * (567) to (585) * (587) to (588)
From EPISODE 561
James Dwyer ~ James Condon	23 episodes	(561) * (564) to (565) * (589) * (604) to (605) * (608) * (618) to (619) * (622) * (628) * (630) * (651) * (664) to (665) * (669) to (670) * (673) * (675) * (677) * 684) to (685) * (689)
From EPISODE 563
Ben Fulbright ~ Kevin Summers	21 episodes	(563) to (564) * (566) to (572) * (574) to (577) * (580) to (582) * (584) to (585) * (587) to (588) * (604)
From EPISODE 574
Eve Wilder ~ Lynda Stoner	27 episodes	(574) to (600)
From EPISODE 585
Rita Connors ~ Glenda Linscott	106 episodes TOP 25	(585) to (596) * (598) to (680) * (682) to (692)
From EPISODE 589
Nancy McCormack ~ Julia Blake	61 episodes	(589) to (626) * (628) to (650)
Jessie Windom ~ Pat Evison	28 episodes	(589) to (612) * (617) to (620)
From EPISODE 590
Dan Moulton ~ Sean Scully	25 episodes	(590) * (597) to (599) * (601) to (608) * (610) to (611) * (614) to (616) * (618) * (647) to (648) * (650) to (654)
From EPISODE 592
Steve Ryan, Dr ~ Peter Hayes	32 episodes	(592) to (606) * (608) to (610) * (612) to (620) * (622) * (624) to (625) * (627) to (628) *
From EPISODE 595
Roach Waters ~ Linda Hartley	27 episodes	(595) to (597) * (602) * (606) * (621) to (625) * (627) to (643)
Bob Moran ~ Peter Adams	26 episodes	(595) to (620)
From EPISODE 599
Janet Williams ~ Christine Earle	32 episodes	(599) * (601) * (603) * (606) to (608) * (613) to (615) * (617) to (639)
From EPISODE 601
Kath Maxwell ~ Kate Hood	79 episodes	(601) * (603) * (610) * (613) to (629) * (631) to (639) * (641) to (651) * (653) * (655) to (692)
From EPISODE 608
Vicki McPherson ~ Rebecca Dines	57 episodes	(608) to (609) * (611) * (613) * (615) * (619) to (620) * (622) * (625) to (626) * (628) to (629) * (633) * (635) * (639) to (647) * (649) to (655) * (658) * (660) to (666) * (670) to (671) * (674) to (683) * (686) to (692) *
From EPISODE 623
Lorelei Wilkinson ~ Paula Duncan	54 episodes	(623) to (675) * (677)
From EPISODE 625
Marty Jackson ~ Michael Winchester	59 episodes	(625) to (626) * (629) to (642) * (644) to (647) * (650) to (656) * (658) * (660) * (662) to (664) * (666) to (669) * (669) * (671) to (675) * (675) * (677) to (692)
Merle Jones ~ Rosanne Hull-Brown	64 episodes	(625) to (632) * (634) to (639) * (641) to (666) * (668) to (685) * (687) to (692) *
From EPISODE 630
Rodney Adams ~ Philip Hyde	58 episodes	(630) to (642) * (644) to (649) * (651) to (671) * (673) to (679) * (682) to (692) *
Delia Stout ~ Desiree Smith	42 episodes	(630) to (634) * (636) to (642) * (644) to (647) * (649) to (654) * (656) to (664) * (666) to (667) * (669) to (670) * (672) to (673) * (675) to (679)
From EPISODE 649
Spider Simpson ~ Taya Stratton	38 episodes	(649) to (686)
From EPISODE 657
Lisa Mullins ~ Terrie Waddell	32 episodes	(657) to (681) * (685) * (687) to (692)
From EPISODE 665
Brumby Tucker ~ Sheryl Munks	26 episodes	(665) to (669) * (671) to (680) * (682) to (692)
Spike Marsh ~ Victoria Rowland	27 episodes	(665) to (691)