
For Halloween. Raj was Aquaman.
The Big Bang Theory Season 12, Episode 24

Halloween traditions
The Big Bang Theory Season 12, Episode 6

You even went as Avatar
for Halloween.
The Big Bang Theory Season 11, Episode 9

PRIYA: I can't believe I'm wearing
my brother's Halloween costume.
The Big Bang Theory Season 4, Episode 24

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