CBS has aired a trailer for the Supergirl and Flash crossover episode "Worlds Finest"
The race between The Flash and Supergirl begins... who is the Fastest Person Alive?
CBS has released a short promo teaser for the Supergirl/Flash crossover "Worlds Finest"
Promotional image and description for the Supergirl and Flash crossover episode "Worlds Finest"
Executive Producers of Supergirl talk about a crossover with The Flash... or the lack thereof.