Sentry is the character in the movie, not Sentinel. More about sentry under the next spoiler.
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He was retconned in to the Marvel universe in the early 2000s as having been there all along. However, due to some comic booky shenanigans the whole world forgot who he was.
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I read this a while back so I don’t remember all the details (like how it was done), but It was Reed Richards that did it to prevent Sentry’s alter ego - The Void - from ever becoming a threat again.
Tap for spoiler
Sentry is the character in the movie, not Sentinel. More about sentry under the next spoiler.
Tap for spoiler
He was retconned in to the Marvel universe in the early 2000s as having been there all along. However, due to some comic booky shenanigans the whole world forgot who he was.
Tap for spoiler
I read this a while back so I don’t remember all the details (like how it was done), but It was Reed Richards that did it to prevent Sentry’s alter ego - The Void - from ever becoming a threat again.
Yes, thank you to all of your points! Silly on my part about who I named (incorrectly) because I know better.