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Oh no, the BBEGs are fighting
(ttrpg.network)
source: He-Man/Thundercats #3 from DC Comics, I tihnk it was published in 2018.
I remember a point where Magneto trapped Red Skull in a metal bunker underground with just bare minimum supplies then sealed the place
Yes, it was in Acts of Vengeance, where Loki gathered various supervillains and suggested they switch their enemies in a grand alliance to destroy heroes. Loki assumed they're all evil so they'll get along...and then had a surprised pikachu when Magneto used portals, that Loki set between villain bases and their meeting hall, to go to Red Skull's base, wreck it and kidnapp the guy.
Once again, Magneto is the best villain