I wonder if Howard
used a RADIOACTIVE tracer.
The Big Bang Theory Season 4, Episode 18
like a RADIOACTIVE monster!
The Big Bang Theory Season 7, Episode 20
That stuff's RADIOACTIVE.
The Big Bang Theory Season 6, Episode 8
But wouldn't Man-Batman just be a Batman
that was bitten by a RADIOACTIVE man?
The Big Bang Theory Season 9, Episode 21
I may be
slightly RADIOACTIVE.
The Big Bang Theory Season 11, Episode 17