This year’s DC Superhero Crossover Event will be three nights over three shows: THE FLASH, ARROW and SUPERGIRL.
Sunday 12/9/18 – crossover night one
8-9p THE FLASH
Monday 12/10/18 – crossover night two
9-10p DC’S LEGENDS OF TOMORROW (note: this LEGENDS episode is not part of the crossover)
Tuesday 12/11/18 – crossover night three
9-10p BLACK LIGHTNING (note: this BLACK LIGHTNING episode is not part of the crossover)
The 100th episode of THE FLASH airs on Tuesday 12/4 at 8p in its regular timeslot.
For the storyline, the crossover episode of THE FLASH makes a one-time-only move to air Sunday 12/9 at 8p; and the crossover episode of SUPERGIRL makes a one-time-only move to air Tuesday 12/11 at 8p.