LaMonica Garrett as DC Comics’ Monitor. The Monitor, of course, was created by Marv Wolfman and George Pérez in the lead-up to their seminal CRISIS ON INFINITE EARTHS, in which the character played a major role. Since then, the Monitor and his kind have appeared in all of DC’s Crisis events, including 2006’s INFINITE CRISIS and 2008’s FINAL CRISIS. While the Arrowverse has gotten increasingly ambitious with its crossovers, frequently drawing from beloved comic book events for inspiration, bringing the Monitor into the action takes things to an entirely new level. Mar-Novu is a figure of infinite power, who, in the comics, single-handedly kept our multiverse’s destruction at bay for millennia. What role he’ll play in the #DCTV crossover is unknown, but considering the planetary destruction visible in the image behind him, it certainly seems like the stakes will be high.