Season 0 of Whose Line Is It Anyway? premiered on October 4, 2000.

Season 1 of Whose Line Is It Anyway? premiered on August 5, 1998.

Season 2 of Whose Line Is It Anyway? premiered on September 16, 1999.

Season 3 of Whose Line Is It Anyway? premiered on October 12, 2000.

Season 4 of Whose Line Is It Anyway? premiered on September 6, 2001.

Season 5 of Whose Line Is It Anyway? premiered on September 9, 2002.

Season 6 of Whose Line Is It Anyway? premiered on June 24, 2004.

Season 7 of Whose Line Is It Anyway? premiered on January 17, 2005.

Season 8 of Whose Line Is It Anyway? premiered on October 3, 2005.