SG-1 Jack O'Neill Richard Dean Anderson young Jack Michael Welch Samantha Carter Amanda Tapping young Carter Christine Kennedy Daniel Jackson Michael Shanks Teal'c Christopher Judge Jonas Quinn Corin Nemic OTHER SGC General George Hammond Don S. Davis young Hammond Aaron Pearl Dr. Janet Fraiser Teryl Rothery Major Charles Kawalsky Jay Acovone Colonel Makepeace Steve Makaj Nyan Richard Ian Cox Dr. Robert Rothman Jason Schombing Jennifer Hailey Elisabeth Rosen Lieutenant Elliot Courtenay J. Stevens Sergeant Siler Dan Shea Dr. Bill Lee Bill Dow Sgt. Walter Harriman Gary Jones FAMILY Charlie O'Neill Dillon Moen Sara O'Neill Harley Jane Kozak General Jacob Carter/Selmak Carmen Argenziano Nicholas Ballard Jan Rubes Claire Jackson Lisa Bunting Melburn Jackson Robert Duncan Rya'c Neil Denis ADOPTIVE CHILDREN little Cassandra Katie Stuart teenage Cassandra Colleen Rennison old Cassandra Pamela Perry Reetou Charlie Jeff Gulka Merrin Brittney Irvin Shifu Lane Gates Loran Kristian Ayre OLD FRIENDS young Catherine Langford Nancy McClure middle-aged Catherine Glynis Davies old Catherine Langford Elizabeth Hoffman young Ernest Littlefield Paul McGillion old Ernest Littlefield Keene Curtis Bra'tac Tony Amendola GOVERNMENT TYPES Major Paul Davis Colin Cunningham Cr. MacKenzie Eric Schneider Colonel Harry Maybourne Tom McBeath Senator Kinsey Ronny Cox Dr. Rodney McKay David Hewlett JACK'S GIRLS Kynthia (Argos) Bobbie Phillips Laira (Edora) Michele Greene SAM'S GUYS Narim (Tollan) Garwin Sanford Martouf (Tok'ra) JR Bourne Pete Shanahan David DeLuise SAM'S GUYS WANNABES Lt. Graham Simmons Tobias Mehler Agent Malcolm Barrett Peter Flemming DANIEL'S GIRLS Sha're Vaitiare Bandera Sarah Gardner/Osiris Anna-Louise Plowman DANIEL'S GIRLS WANNABES Princess Shyla Heather Hanson TEAL'C'S GIRLS Drey'auc Brook Parker Shan'auc Musetta Vander SYSTEM LORDS Apophis Peter Williams Hathor Suanne Braun Heru'ur Douglas H. Arthurs Seth/Setesh Robert Duncan Nirrti Jacqueline Samuda Yu Vince Crestejo Cronus Ron Halder Sokar David Palffy Ba'al Cliff Simon Zipacna Kevin Durand Olokun Kwesi Ameyaw Kali Suleka Mathew Bastet Natasha Khadr Anubis David Palffy ANCIENTS Oma Desala Mel Harris Orlin Sean Patrick Flanery Ayiana (not ascended) Ona Grauer NOX Lya Frida Betrani TOLLAN Omoc Tobin Bell High Chancellor Travell Marie Stillin TOK'RA Jolinar Tanya Reid Anise/Freya Vanessa Angel Kelmaa/Egeria Gwynyth Walsh ASGARD Thor voice: Michael Shanks Heimdall voice: Teryl Rothery Loki voice: Peter DeLuise ABYDOS Skaara Alexis Cruz Kasuf Erick Avari Nem Gerard Plunkett Gairwyn Tamsin kelsey Harlan Jay Brazeau young Linea/Ke'ra Megan Leitch old Linea Bonnie Bartlett The Keeper Dwight Schultz Urgo/Togar Dom DeLuise Chaka Patrick Currie Aris Boch Sam J. Jones Tanith Peter Wingfield Dr. Svetlana Markov Marina Sirtis Martin Lloyd Willie Garson Mollem Dion Luther Lieutenant Tyler (chemical diguise) Dion Johnstone Adrian Conrad Bill Marchant Reese Danielle nicolet Fifth Patrick Currie Warrick Finn Alex Zahara Ishta Jolene Blalock Grace Sasha Pieterse Anna Kristen Dalton President Henry Hayes William Devane Dr. Elizabeth Weir Torri Higginson Camulus Steve Bacic Kull Warrior Dan Payne Machello Michael Shanks