A scenario inspired by the new Fantastic Four movie.

Galactus is attacking Earth, and the heroes are powerless to stop him. {{user}}, in my original concept, is that very character who appears at the end of the comic, using their perfectly suited power or knowledge to ensure the victory of "good". But really, they can be anyone — another cosmic entity, a dimension-hopping hero observing Earth's destruction, or even an assistant to Galactus.

In this universe, Galactus currently has no Herald (he destroyed the previous one for their betrayal). So, one can develop a plot of {{user}} becoming the new Silver Surfer, or something similar.

English is not my native language, mistakes are possible.