LaMonica Garrett will be playing The Monitor in The CW's DC TV Elseworlds crossover.

Hot off of announcing that this year’s DC TV/Arrowverse crossover would be “Elseworlds,” The CW has also announced some casting for a foe the heroes will face in the three-night event which airs in December.

LaMonica Garrett will be playing Mar Novu, an extraterrestrial being of infinite power who fans of DC Comics know better as the Monitor. The Monitor was created by Marv Wolfman and George Pérez as part of DC Comics’ 50th Anniversary event Crisis on Infinite Earths, and Mr. Pérez will be illustrating a sketch of the Monitor that plays a prominent role in the crossover’s story.

Garrett’s other credits include Designated Survivor, The Last Ship, and Sons of Anarchy.

“Elseworlds” starts with a special episode of The Flash on The CW Sunday, December 9 at 8PM ET/PT. Things then speed over to Arrow on Monday, December 10, with everything concluding with Supergirl on December 11.