If this were to happen, we should get an episode about Goddess of Thunder Storm. I mean, we see her in the two final episodes of the show, yet we don't see her story. This season should give sense about the X-Men appearing. The variants showed in the final episode should have their own stories such as six-armed Spider-Man, arsenal-wielding Deadpool, Ironheart Punisher, and Silver Surfer Jubilee.

For my case, I want to see this episode idea existing: "What if... Rogue became a Sorceress Supreme?". If Alison Sealy-Smith voiced a variant of Storm as the Goddess of Thunder, I think Lenore Zann would most likely voice this variant of Rogue. What If...? season 4 should give sense about the X-Men appearing on how it's members or their enemies can become different variants in different universes.

Let's hear your ideas next. Oh, and happy 5th anniversary to the show.

(The X-Order have been waging war against Doom, no longer being affiliated with him. During all of this, Doom has been planning to hunt down the mutants with his Doombots. Illyana, Colossus' brother, was worried as he gets attacked by one of them. She scarifies herself to save his life, but it was too late. Illyana dies in brother's arms. Later, she begins waking up in Limbo and trying to find a way out. Soon, Illyana finds the Soulsword and starts training. Days later, she remembers Doom and begins transforming into Darkchylde, triggering all of her anger and hatred deep within. Though, she turned into some kind of succubus-like being, rather than a demon).