Elizabeth Olsen crashes 'SNL' and plunges Benedict Cumberbatch into the multiverse

Benedict Cumberbatch hosted Saturday Night Live just as his new movie Doctor Strange in the Multiverse of Madness arrives in theaters. To give the occasion a bit of extra oomf, his Strange co-star Elizabeth Olsen showed up to heighten one of the evening's sketches.

In "The Understudy," we see SNL's Chloe Fineman delivering...