Warning! This post contains SPOILERS for What If…? Season 3, episode 4Several long-forgotten MCU villains return in What If…? season 3 episode 4, including one of the least popular antagonists in the whole franchise. Throughout the years, the MCU has introduced many villains that haven’t stuck the landing. For instance, Phase 2’s Ronan, Yellowjacket, and the now-returning Ultron failed to make an impact with audiences despite their huge potential, and the Multiverse Saga has given simple one-off appearances to villains as famous and powerful as Gorr the God Butcher, Kang the Conqueror, and the Deviants.

https://screenrant.com/what-if-season-3-malekith-return-kaecilius-explainer/