Moon Knight is one of the perfect characters for an idea like this.
It's pretty simple to introduce his origin in 10 minutes. Start it off with Marc Spector and Raoul Bushman in Egypt in search of an ancient pharaoh's tomb, like in the comics. Upon arriving, greedy Bushman turns on Marc and wounds him as Marc manages to make his way to Khonsu's tomb before blacking out. Then show how Khonsu revives him and selects him as his next avatar. A quick shot of Moon Knight in action and then fade to black with the words "Vengeance Is Coming".
Basically a quick wip of his origin like in this pic:
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