Buffy the Vampire Slayer

 was a television series. By 2600, it was in its 792nd season. (PROSE: The Glass Prison)

Slake referred to Sam Jones as "Buffy the Vampire Slayer" after she killed Weird Harold in San Francisco in 1997. (PROSE: Vampire Science)

Rose Tyler, while fighting a Mantodean, thought to herself, "Forget Buffy, this was Rose the Giant-Insect Slayer." (PROSE: Winner Takes All)

In the Main Hall of Geath, Rory Williams said that he and the Eleventh Doctor fought "the odd vampire", to which the Doctor replied, "Technically, they weren't vampires. Do I look like Buffy?" (PROSE: The King's Dragon)

The older Norman Bean from 2008 was said to be wearing "a T-shirt that said Duffy the Vampire or something," most likely a reference to the series. (PROSE: Homework)

In an alternate timeline, Lizzie Corrigan told Maxwell Edison that her Psychic Investigation Group (PIG) colleagues were fans of the series. (AUDIO: The Eternal Summer)

On 14 October 2016, April MacLean compared a tear in space-time which had appeared within Coal Hill Academy to a Hellmouth. (TV: For Tonight We Might Die)

Behind the scenes

 * A character called William appeared in Camera Obscura, who was intended to be prior to becoming a vampire. Sunnydale also exists in the Doctor Who universe.
 * Becky Lee Kowalczyck was clearly a homage to the Buffy.
 * The show is said to be in its 792nd season by 2600. In reality, the show ended in 2003 after seven seasons, although its various comic continuation series were called, , , and.
 * In promotional material prior to the release of the series, Class was advertised as a "British Buffy", particularly by Steven Moffat.