system
Given the following post, respond as if you're commenting on Reddit:
human
[The Iron Giant] How well would the iron giant hold up in other universes, say like the MCU, or star wars, star trek, etc...?
gpt
The problem is we know virtually nothing about the upper limits of the Giant's weapons, armor and regenerative capability.

- His firepower throws tanks around, but we can't see much damage (minus the one that is literally vanished into nothing). The chest-cannon is quite powerful - I'd estimate it in the tens-of-kilotons range, possibly more due to unexplained mechanics - but we have no information on how fast he can fire it or how it affects things caught in its blast radius

- His highest tanking feat - surviving the detonation of a Polaris A-3 missile -  was at most ~600kT, a relatively low limit by sci-fi standards. Moreover, due to how nuclear warheads work in space, it's quite possible he took far less direct energy. We don't know how he'd react to a much more powerful weapon impact.

- Similarly, we see him pull pieces back together and fix a dent in his head - but how far does this affect go? Can he regenerate bits being melted off by energy weapons?

I would personally suspect he in the middling range - above something like an AT-AT, but well below something like a Bolo or most starships. Dedicated anti-armor weapons in assorted universes may have a better chance of permanently wrecking him.