
NARRATOR:
Previously on The Big Bang Theory:
The Big Bang Theory Season 6, Episode 1

♪ Bang! ♪
The Big Bang Theory Season 7, Episode 7

♪ That all started
with a big BANG ♪
The Big Bang Theory Season 5, Episode 7

♪ Bang!♪
The Big Bang Theory Season 12, Episode 6

# Bang! #
The Big Bang Theory Season 11, Episode 8