Ba'al travels back in time and prevents the Stargate program from being started. SG-1 must somehow restore history.
| Actor | Role |
|---|---|
 Ben BrowderColonel Cameron Mitchell | Colonel Cameron Mitchell |
 Amanda TappingColonel Samantha Carter | Colonel Samantha Carter |
 Christopher JudgeTeal'c | Teal'c |
 Michael ShanksDr. Daniel Jackson | Dr. Daniel Jackson |
 Claudia BlackVala Mal Doran | Vala Mal Doran |
 Beau BridgesMajor General Hank Landry | Major General Hank Landry |
 Richard Dean AndersonMajor General Jack O'Neill | Major General Jack O'Neill |
 Cliff SimonBa'al | Ba'al |
 Don S. DavisLieutenant General George Hammond | Lieutenant General George Hammond |
 William DevanePresident Henry Hayes | President Henry Hayes |
 Steve BacicCamulus | Camulus |
 Gary JonesChief Mst Sgt. Walter Harriman | Chief Mst Sgt. Walter Harriman |
 Peter WilliamsApophis | Apophis |
 Jacqueline SamudaNirrti | Nirrti |
| JJay WilliamsRa | Ra |
| CCorey TurnerHelmsman | Helmsman |