‘Black Mirror’: Everything to remember about the original ‘USS Callister’ before watching new follow-up

More than seven years ago, Black Mirror's fourth season introduced a dark take on Star Trek with the fan-favorite episode "USS Callister." This week, with the launch of the Netflix sci-fi anthology's seventh season, most of the cast is back for a sequel.

The final episode of Season 7, "USS Callister: Into Infinity," catches up with the surviving members of the crew. They may have escaped a dire fate before, but now they need to figure out what comes next.

To get you ready for the sequel...