Starscream M
The following characters are trapped in an enclosed Adamantium football stadium. The one stipulation is that the stadium will only open when ONE is left standing. Everyone is in character.
Alliances can happen, if it's in character. You should theorize what would likely happen in this scenario, so the last one standing may not necessarily be the most powerful one.
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Thor
Hulk
Silver Surfer
Superman
Flash (Wally)
Wonder Woman
Black Adam
Darkseid
Sinestro
Ultron
Thanos
Magneto
Alliances can happen, if it's in character. You should theorize what would likely happen in this scenario, so the last one standing may not necessarily be the most powerful one.
---
Thor
Hulk
Silver Surfer
Superman
Flash (Wally)
Wonder Woman
Black Adam
Darkseid
Sinestro
Ultron
Thanos
Magneto