
...Superman cleans his uniform
by flying into Earth's yellow sun...
The Big Bang Theory Season 2, Episode 11

A marathon? Wow, how many
Superman movies are there?
The Big Bang Theory Season 1, Episode 2

Plus Superman and Godzilla.
The Big Bang Theory Season 1, Episode 5

Superman works up a sweat, comes back
to Earth, his uniform now stained...
The Big Bang Theory Season 2, Episode 11

Superman is vulnerable to magic.
The Big Bang Theory Season 1, Episode 5