A pizza delivery driver that resents Superheroes, is inadvertently stuck protecting one when the worlds greatest supervillain arrives in his city during a typical afternoon shift.

I'd study "The Boys" the TV show to make sure your premise isn't too similar to it. It's also a guy who hates superheroes because they accidentaly killed his girlfirend, and in the end he grows a connection with one of them despite it.

I agree with the other posters about clarifying the "fatally injured superhero" part. Overall, I just wanted to say that it's definitely an engaging logline.

Again thanks for the clarification:

Then I would suggest the logline needs to clearly indicate that he must help the superhero in spite of his feelings because he does have skin in the game, after all.? Because of the stakes:? if he doesn't get involved, then it's not just the superhero who will die, so will innocent people, and so will the protagonist.