Mother, she's an atheist, not a VAMPIRE.
The Big Bang Theory Season 9, Episode 24
Buffy the Vampire Slayer
continued on as a comic book.
The Big Bang Theory Season 6, Episode 21
...and the VAMPIRE bites a human...
The Big Bang Theory Season 6, Episode 9
If a zombie bites a VAMPIRE...
The Big Bang Theory Season 6, Episode 9
Is that Buffy the
Vampire Slayer?
The Big Bang Theory Season 12, Episode 23