Storyline:
The vengeful Ba'al travels back in time to 1939, where he prevents the Stargate program from being started. In response to his actions, the SG-1 team must restore history before they're erased from existence.

Cast:

Ben Browder Lt. Col. Cameron Mitchell

Amanda Tapping Lt. Col. Samantha Carter

Christopher Judge Teal'c

Michael Shanks Daniel Jackson

Beau Bridges Mjr. Gen. Henry 'Hank' Landry