Alien Nation: Millennium

Ben, Gwen, and Max must stop an extraterrestrial who plans to open a gateway that leads to an alien invasion.

Diagnosed with a black hole growing inside her chest and stuck in a loop reliving the last five days of her life, a 55-year-old wife and mother from Miami, Florida decides to solve time travel in order to go back and be the person she always intended to be.

Orbiting a quiet backwater planet, the massed forces of the universe's deadliest species gather, drawn to a mysterious message that echoes out to the stars. And amongst them, the Doctor. Rescuing Clara from a family Christmas dinner, the Time Lord and his best friend must learn what this enigmatic signal means for his own fate and that of the universe.

Ba'al travels back in time and prevents the Stargate program from being started. SG-1 must somehow restore history.