Quote:

Prometheus said:
If he's invisible all the time, how do you know what he looked like?


We're assuming that it's all the time. I don't think that's necessarily the case.

I have a feeling that, unlike a majority of the other heroes (and unlike all the heroes Peter's met), the invisible guy has a good amount of control over his powers. In other words, he can turn them on and off. If Peter can figure out how the invisible man learned to control his powers, maybe he can too (and avoid asploding).