
Halloween party here.Okay.
The Big Bang Theory Season 12, Episode 6

More Halloween candy?
The Big Bang Theory Season 5, Episode 7

A time machine from a science-fiction show
has nothing to do with Halloween.
The Big Bang Theory Season 6, Episode 5

Happy Halloween.
The Big Bang Theory Season 1, Episode 6

Except the Halloween costume
The Big Bang Theory Season 7, Episode 2