Supergirl guards the endangered American President (Lynda Carter), Mon-El (Chris Wood) awakens, and Renee Montoya Maggie Smith (Floriana Lima) joins forces with Alex Danvers. We learn that this Earth is very familiar with aliens, M’gann M’orzz (Sharon Leal) reveals herself to fellow Martian J’onn J’onzz, and Snapper Carr (Ian Gomez) continues to have no appreciable connection to his comic-book namesake.

The Flash and Jesse Quick (Violett Beane) join forces with an old Rogue (Wentworth Miller) against a couple of new Rogues, Mirror Master (Gray Damon) and Top (Ashley Rickards). Meanwhile, the team interview for a new Harrison Wells and Caitlin Snow lives up to her name.

Discussion below: