system
Given the following post, respond as if you're commenting on Reddit:
human
[DCEU] Why didn't the other superheroes/metahumans help when Zod invaded earth?

Zod was a treath to the whole planet, so it would be on everyone's interest to stop him

He also announced his intentions to the entire world and the invasion lasted at least a day, so you can't give the "It ended too fast" excuse.

Yet only Superman and Batman tried to help.

Why didn't Wonder Woman, Aquaman, Martian Manhunter, the Flash, Cyborg, or any of the supervillains who would want to save earth because they live here fight agains Zod?
gpt
While we know Wonder Women had been doing super hero stuff, the implication of Man of Steel is that Superman is the first super hero (which was consistent with DC's New 52 storyline at the time establishing the rise of Superman as the start of the era of heros).

Yes Batman had been doing his thing, but he wasn't a hero, but a vigilante. We see that Bruce Wayne did go to Metropolis, but that was to ensure his people were evacuated. Wonder Women may have been in Europe already. Cyborg was brooding at home. The Flash may not have suited up yet. And Aquaman may not have known it was happening.