The scientists
that proved the big BANG,
The Big Bang Theory Season 12, Episode 13
BERNADETTE: Previously on
The Big Bang Theory...
The Big Bang Theory Season 10, Episode 24
♪ That all started
with a big BANG ♪
The Big Bang Theory Season 12, Episode 2
♪ That all started
with a big BANG ♪
The Big Bang Theory Season 5, Episode 3