On Monday the DCTV Universe begins it's expansion! The Flash will introduce himself to National City and meet Supergirl for the first time! To get prepared for this momentous occasion, check out these four clips previewing the huge episode!

Monday's episode is titled "World's Finest" and the synopsis is as follows:

Are you guys psyched for this episode? How do you feel about the Multiverse idea with all of these shows? Are you concerned that Supergirl has yet to be renewed for a second season? Sound off in the comments below!