Arrow Executive Producer Marc Guggenheim says that comic book writer Marv Wolfman will co-write season 8 episode 8 with him - Arrow's entry into CW's "Crisis On Infinite Earths" TV crossover. Guggenheim broke the news at a Television Critics AssociationA panel (via Deadline).
Wolfman wrote the Crisis on Infinite Earths comic book limited series, which rebooted DC's comic book continuity to combine multiple disparate timelines into one combined history.
For CW's "Crisis on Infinite Earths," Arrow will crossover with Flash, Supergirl, DC's Legends of Tomorrow, and Batwoman. Characters from Black Lightning will also appear.