Stargate: Continuum is a 2008 American military science fiction film directed by Martin Wood and written by Brad Wright.

The film stars the main cast of the series' last season, with the return of Richard Dean Anderson as Jack O'Neill.

The film is a time-travel adventure in which Ba'al travels back to 1939 to create an alternate timeline in which Earth never establishes their Stargate Program, and to take control of the Goa'uld Empire.

The real Ba'al travels back in time to 1939 Earth and massacres the crew of the Achilles, the ship carrying the Stargate to the United States.

Jack is killed by the clone, but Samantha Carter, Daniel Jackson and Cameron Mitchell reach the Stargate.

They are surprised to emerge inside the derelict Achilles, which has drifted to the Arctic — Ba'al's actions have created a timeline in which the Stargate Program never happened.

In the alternate timeline, Daniel is still trying to convince people about his theories of the pyramids, Carter died in a space shuttle accident and Mitchell does not exist at all because his grandfather was the Achilles captain.

Ba'al has brought the other System Lords under his control and now stands ready to conquer Earth, with Qetesh, still residing in Vala's body, as his queen and Teal'c as his First Prime.

As Teal'c escapes to an Al'kesh, Qetesh orders the fleet to bombard Earth, while she goes to secure Ba'al's time machine.

Some scenes for this film were already shot at the end of March 2007, but the original start date was set for May 22, 2007 at Vancouver's Bridge Studios.

[1] Due to the postponement of this film until the 5th season of Stargate Atlantis was airing, there is a continuity error with Carter and Mitchell's rank.

In the season 5 premiere of that show, Sam, already a colonel, leaves Atlantis to attend the extraction, thus setting this film about a year after Stargate: The Ark of Truth.

The unnamed Captain of the Achilles' dead body was originally supposed to be revealed when SG-1 travelled back to Earth; Wright commented on the case, calling it "gross".

In order to make his disappearance plausible, Wright decided that Jackson would develop frostbite after stepping in water and be unable to continue with the others.

[15] He was later honored in Stargate Universe by having the ship named for his character George Hammond commanded by Samantha Carter.

On its debut in the United Kingdom and Ireland Stargate: Continuum received 543,000 viewers, placing the film first in the top ten broadcasts for Sky One.

[26] Don Houston from DVD Talk commented that the "budget was too low" for the writers to "support the ideas at hand".

Claudia Black received the award for "Best Female Performance in a 2008 Science Fiction Film, TV Movie, or Mini-Series" for her portrayal of Vala Mal Doran.