Ba'al travels back in time and prevents the Stargate program from being started. SG-1 must somehow restore history.
Ben Browder
Amanda Tapping
Christopher Judge
Michael Shanks
Claudia Black
Beau Bridges
Richard Dean Anderson
Cliff Simon
Don S. Davis
William Devane
Steve Bacic
Gary Jones
Peter Williams
Jacqueline Samuda
Jay Williams
Corey Turner