Season 0 of Whose Line Is It Anyway? premiered on March 9, 1989.

Season 1 of Whose Line Is It Anyway? premiered on September 23, 1988.

Season 2 of Whose Line Is It Anyway? premiered on November 10, 1989.

Season 3 of Whose Line Is It Anyway? premiered on January 18, 1991.

Season 4 of Whose Line Is It Anyway? premiered on January 24, 1992.

Season 5 of Whose Line Is It Anyway? premiered on March 5, 1993.

Season 6 of Whose Line Is It Anyway? premiered on July 1, 1994.

Season 7 of Whose Line Is It Anyway? premiered on July 28, 1995.

Season 8 of Whose Line Is It Anyway? premiered on July 12, 1996.

Season 9 of Whose Line Is It Anyway? premiered on July 10, 1997.

Season 10 of Whose Line Is It Anyway? premiered on November 11, 1998.