>>213676248 (OP)
>how do you beat Superman
Literally nukes, placed all over the planet. Give him designated areas he can be in, and if he leaves without permission, you set off a nuke on the other side of the planet, killing millions. Deprive him of sunlight until heβs as weak as a human, and then keep him that way.
If there was a βSupermanβ and it was like Man of Steel, that is precisely we would do. Oh and the moment kryptonite is discovered; kill him with it. Heβs too much of a liability with all that power, and also, what happens if grows old and gets dementia or some other strange illness only his species can get? IRL, Superman would either have to stay hidden, be bad, or be killed. Simple as.