* [[Series/{{Firefly}} Mal]] found himself some religion [[spoiler:of evil]] in season 7.
* [[Series/{{Glee}} Sandy]] could have played Principal Flutie according to the unaired pilot.
* [[ThreesCompany Jack Tripper]] could have been Buffy's stepfather, had he not been a robot.
* Stars of ''Series/TwentyFour'' were here too. Roger Stanton was head of the Watchers Council, Wayne Palmer was Sunnydale High's last principal and Secret Service agent Aaron Pierce is the father of a teen who might trying to kill herself in season 7.
* [[Film/ConAir Billy Bedlam]] convinced Riley to go back to the military.
* [[Series/HowIMetYourMother Ted's stepfather]] was mayor of Sunnydale.
* LizzieMcguire's best friend Miranda is a potential slayer, or was before she hanged herself.
* JoanOfArcadia is Dawn's best friend Janice.
* [[SixFeetUnder Claire Fisher's boyfriend]] is Xander's best friend Jesse who got turned into a vampire and then grew up to be a [[{{Conviction}} prosecutor]]
* [[Film/MortalKombatAnnihilation Shao Kahn]] is both The Judge and The Master's henchman, Luke.
* [[TheOC Summer]] is one of the Potentials, at least in Xanders dream.
* AmyAdams is Tara's cousin. What a bitch.
* [[Film/HaroldAndKumarGoToWhiteCastle Kumar]] is a college student who got turned into a caveman.
* Mr. Moseby from ''TheSuiteLifeOfZackAndCody'' was Sunnydale High's psychologist, until a student ripped half his face off.
* The police chief from ''Series/{{Psych}}'' was Buffy's boss at Doublemeat Palace.
* ...and Music{{Ashanti}} is the last demon Xander dates.
* [[Series/TheWestWing Mrs. Landingham]] is a retired teacher who used to punish naughty children. Two seasons later, ''young'' Mrs. Landingham runs the Doublemeat Palace.
* [[FreaksAndGeeks Millie Kentner]] is Amanda the Potential.