Buffy the Vampire Slayer

The universe of Buffy the Vampire Slayer, or the Buffyverse, is mainly comprised of two television series...

Buffy the Vampire Slayer (1997-2003)

Angel (1999-2004)

It was also continued, canonically, in comic book form.

Buffy Season 8 (40 issues, 2007 to 2011)

Angel: After the Fall (44 issues, 2007-2011)

Buffy Season 9 (25 issues, 2011-2013)

Buffy Season 10 (30 issues, 2014-2016)

Buffy Season 11 (11 issues, 2016-present)

In addition, there were multiple spinoff mini-series from those comic books.

Alternate Universes
Buffy the Vampire Slayer (1992 film)