We finally got what we've been wanting since they announced the Supergirl series. CBS announced today that Flash will be crossing over to visit Supergirl in National City! Grant Gustin, who currently plays Barry Allen aka The Flash on CW's The Flash will make the trek over to CBS' Supergirl in an episode set to air on March 28th.

Earlier this year we got a small dose of network spanning crossovers when NBC's (canceled series) Constantine star and namesake, Matt Ryan as John Constantine traveled to Star City to aid Oliver Queen in an episode of Arrow.

Now the speculation can begin! Will this be one of the many multiverses that Barry travels to through one of the breaches in Central City? Is National City and it's resident super-heroine, Supergirl part of the same shared universe as The Flash, Arrow, and Legends of Tomorrow? Sound off in the comments below!