Benedict Cumberbatch on Watching ‘WandaVision’ as Prep for ‘Doctor Strange’ Sequel (Exclusive)

Benedict Cumberbatch chats with ET’s Rachel Smith about why he ‘had’ to watch ‘WandaVision.' The 44-year-old actor teases ‘Doctor Stranger and the Multiverse of Madness,’ and says he’s already shared ‘some pretty extraordinary moments’ with Elizabeth Olsen while filming the Marvel sequel. Plus, Cumberbatch opens up about losing weight to portray his character’s physical transformation in his new movie, ‘The Courier,’ in theaters Mar. 19, and jokes about whether or not he would make a good spy in real life!