Marvel Studios may introduce a powerful multiversal villain into the MCU for Thor 5 who could create strong connections to Loki season 2 and the MCU's upcoming Fantastic Four reboot. After the disappointing performance of 2022's Thor: Love and Thunder, which saw Chris Hemsworth return for his fourth solo project as the Asgardian God of Thunder, major changes are expected for the MCU's Thor franchise. Among these changes, the comedic tones introduced by director Taika Waititi are expected to be replaced by a darker storyline, and there has been talk of a new villain being introduced who is even more powerful than Thor: Ragnarok's Hela, the Goddess of Death.

https://screenrant.com/marvel-theory-villain-thor-5-loki-season-2/