
♪ Bang! ♪
The Big Bang Theory Season 7, Episode 5

♪ That all started
with a big BANG ♪
The Big Bang Theory Season 12, Episode 13

♪ That all started
with a big BANG ♪
The Big Bang Theory Season 7, Episode 11

...the fingerprints of string theory
in the aftermath of the big BANG.
The Big Bang Theory Season 1, Episode 1

Previously on
The Big Bang Theory...
The Big Bang Theory Season 12, Episode 19