Here’s what’s happening in the world of television for Monday, December 10. All times are Eastern.
Arrow (The CW, 8 p.m.): Last night, the Arrowverse’s annual super-duper mega intense can’t-miss holy crap all-skate crossover event began, with The Flash swapping places with Supergirl (which will instead air tomorrow) and The Flash, a.k.a. Barry Allen, similarly switching lives with the Green Arrow, a.k.a. recently freed felon Oliver Queen. It’s nuts!
Tonight, the saga continues, with Kara Danvers (Melissa Benoist), Barry (Grant Gustin), Oliver (Stephen Amell), and their gang of super-friends joined by Batwoman (Ruby Rose), Superman (Tyler Hoechlin), Lois Lane (Elizabeth Tulloch), and other special guests zooming in to make the epic crossover event even more epically crossoverish. Allison Shoemaker will drop in on Star City to recap the proceedings.
Pentatonix: A Not So Silent Night (NBC, 10 p.m.): Y’all like mouth-sounds? Pentatonix have got mouth sounds. Tune in to see exactly how intensely full of mouth sounds their rendition of “Little Drummer Boy” and other such standards can be.