The Flash's final season premiere will kick off a five-part "Armageddon" crossover event

TheWrap

Starting with the Nov. 16 Season 8 premiere, the "Armageddon" event will feature Batwoman's Javicia Leslie and Black Lightning's Cress Williams, plus Brandon Routh as The Atom, Chyler Leigh as Sentinel, Kat McNamara as Mia Queen, and Osric Chau as Ryan Choi. Additionally, Neil McDonough and Tom Cavanagh return as Damien Darhk and Eobard Thawne/Reverse Flash. Williams and McNamara will reprise their roles after the finales of their respective shows, Black Lightning and Arrow. Here's the official logline for "Armageddon": "A powerful alien threat arrives on Earth under mysterious circumstances and Barry (Grant Gustin), Iris (Candice Patton) and the rest of Team Flash are pushed to their limits in a desperate battle to save the world.  But with time running out, and the fate of humanity at stake, Flash and his companions will also need to enlist the help of some old friends if the forces of good are to prevail."