
♪ Bang! ♪
The Big Bang Theory Season 7, Episode 16

♪ Bang! ♪
The Big Bang Theory Season 5, Episode 14

♪ That all started
with a big BANG ♪
The Big Bang Theory Season 7, Episode 18

♪ That all started
with a big BANG ♪
The Big Bang Theory Season 5, Episode 20

Previously on
The Big Bang Theory...
The Big Bang Theory Season 12, Episode 17