The CW is planning a crossover to top all crossovers -- a four-way superhero event bringing together the newly-acquired Supergirl, DC's Legends of Tomorrow, The Flash, and Arrow for a mega crossover.
"Our crossover event this fall will be the biggest one ever," The CW president Mark Pedowitz told reporters.
The crossover will be the third annual crossover for the network, but this time around, the crossover will run four nights.
Supergirl is moving to The CW after one season on CBS and will air on Monday nights. The Flash and Arrow will remain in their Tuesday and Wednesday time slots, respectively, and DC's Legends of Tomorrow will air on Thursdays this fall instead of mid-season.
Speculation is the crossover will begin with Supergirl and continue each week night with that day's scheduled show, probably in December.