Stargate: Continuum (2008)

It is sometimes hard to forget that the Stargate portal works both ways. But when the evil Ba’al (Cliff Simon) decides to go back in time to prevent the discovery of the portal, the gang must somehow figure out how to stop him. They realize that not just the discovery of the portal is in jeopardy but the entire course of humankind. Lt. Colonel Mitchell, (Ben Browder), Dr. Jackson (Michael Shanks) and Col. Carter (Amanda Tapping) are constantly one step behind Ba’al as he traces the steps that led to the monumental discovery. They need more time but as time runs out to destroy Ba’al once and forever, they fear that for once they will not succeed.