"Payload Specialist Howard
Wolowitz is requested
The Big Bang Theory Season 5, Episode 18
with that SPECIALIST in Houston.
The Big Bang Theory Season 5, Episode 6
where I spent two months
as a payload SPECIALIST,
The Big Bang Theory Season 9, Episode 9
as a payload SPECIALIST,
and guess who that someone is.
The Big Bang Theory Season 5, Episode 5
and Payload Specialist
Howard Wolowitz."
The Big Bang Theory Season 5, Episode 15