WandaVision Episode 8 finally gave Marvel fans something they've been waiting for since Wanda Maximoff (Elizabeth Olsen) was introduced to the Marvel Cinematic Universe: The official "Scarlet Witch" codename! The new WandaVision episode "Previously On..." sees Agatha Harkness (Kathryn Hahn) take Wanda on a trip down memory lane, revisiting the key traumas of the past that inspired Wanda's unprecedented outburst of reality-altering magical power. (Spoilers) At the end of that journey is the inevitable final showdown between these two magically-powered women, and it's during that battle that Agatha drops some magic-based knowledge on Wanda - namely that she's a "Scarlet Witch" who's channeling the power of Chaos Magic!