Still don’t really understand the concept of the multiverse in the world of The Flash? Well, Barry Allen (Grant Gustin) offers up a free science lesson in a new clip from the crossover episode with Supergirl.
The footage released by CBS shows a scene in which Jimmy (Mehcad Brooks) and Winn (Jeremy Jordan) try to wrap their head around the fact that a being from another Earth is standing in front of them. Thankfully, Kara (Melissa Benoist) has the scarlet speedster to explain the concept — and with visuals!
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The crossover episode sees Barry helping Kara battle the villains Silver Banshee and Livewire in exchange for help returning to his Earth. The action will commence on Monday at 8 p.m. ET on CBS, and EW has the scoop on everything you need to know beforehand.