Okay, who’s messing with the Multiverse? The CW’s upcoming “Elseworlds” crossover event features the casts of The Flash, Arrow and Supergirl combining to confront a threat to the fabric of their very existence. Up is down, down is up and just when you think you know something, it gets taken away and turned into a polka dot trout or something.

We also know that the crossover will introduce some major new players to the Arrowverse, including LaMonica Garrett’s otherworldly Monitor, Kate Kane’s Batwoman, Elizabeth Tulloch’s Lois Lane and Jeremy Davies’ villainous Dr. John Deegan. We get some great looks at all four of them in the just-released new images from the three-night event, along with Tyler Hoechlin’s Superman going full Smallville, more of our identity-swapped Green Arrow and Flash, Cisco Ramon looking like a complete boss and the always exciting hero line up featuring our three main stars…plus John Wesley Shipp wearing the Flash costume from his 1990 Flash series (!!!). You might want to take a look while you can because at the rate the world of The CW’s heroes seems to be changing, these photos could turn into pics of your mother-in-law’s weekend Tupperware party well before the crossover begins next month.

“Elseworlds,” a three-night #DCTV crossover event, begins on Sunday, December 9 at 8 p.m. (7 p.m. CST) on The CW.