Old friends return in “Ripple Effect,” and we have the first photos from the upcoming Stargate SG-1 episode!

In the episode the Stargate malfunctions, leading SG-1 to encounter multiple versions of themselves from parallel universes.

Beware of spoilers!

“Ripple Effect” premieres Friday, January 20 at 8 p.m. Eastern/Pacific on The SCI FI Channel in the U.S. Visit GateWorld’s episode guide to learn more about the episode!