...Superman cleans his uniform
by flying into Earth's yellow sun...
The Big Bang Theory Season 2, Episode 11
...do you wanna join us for Thai food
and a Superman movie marathon?
The Big Bang Theory Season 1, Episode 2
(HUMMING "SUPERMAN" THEME SONG)
The Big Bang Theory Season 2, Episode 21
Superman doesn't sweat on Earth.
The Big Bang Theory Season 2, Episode 11
Plus Superman and Godzilla.
The Big Bang Theory Season 1, Episode 5