While scrolling the X-Men section in the Disney+ catalog, I started to remember a scene from the 90s X-Men cartoon. As far as I remember, this was a multipart episode which ended like this:
All the X-Men (and maybe Magneto's gang) were defeated by an humanoid (alien?) individual. The individual then started to board a UFO like vehicle. Magneto tried to stop it but is immediately defeated by the individual and the episode ends.
Before starting to fully watch X-Men again, I'd like to know the name of the episode.