Flash hits the mid-season finale. Considering one of the most often repeated lines on the show is, “Run, Barry, Run!” and the nature of his powers, I guess they went for irony with the title, “Don’t Run.”
Part four of Crisis on Earth X jumps in exactly where part three ended, as Legends of Tomorrow finishes the team-up.
The big crossover, Crisis on Earth X, continues in its third part on Flash. Several of the heroes are in what appears to be a concentration camp, and things are looking grim.
The Crisis on Earth X continues with part two, as Arrow shifts to another night for the fun. Part one ended with Prometheus held captive in the Pipeline, pulling his mask off.
Last year, the big CW-verse crossover was about aliens attacking. This time, the threat comes from somewhere else. Last year, they also made the Supergirl episode barely a part of it, and they fix that this time around.
This episode of Flash has enough flashbacks in it that it could have been part of Arrow.
This episode of Flash parodies a comedy classic for its title with, “When Harry Met Harry.”