And Monday night, The Big Bang Theory got in on the crossover, too, leading up to The Flash’s Season 3 premiere tonight.
This wasn’t the first time the Flash has shown up on The Big Bang Theory: all four guys dressed up as the speedster for Halloween one year, and Sheldon even turned into the Flash the first time he drank caffeine back in Season 2.
The Big Bang Theory airs Mondays at 8/7c on CBS.
After all, CBS is one of the CW’s parent companies (it’s also TVGuide.com’s parent company, full disclosure), and Warner Bros., the CW’s other parent company, produces The Big Bang Theory.