Molly Shannon is an American comic actress best known for her work as a cast member on Saturday Night Live from 1995 to 2001 and for starring in the films Superstar and Year of the Dog. More recently, she starred in NBC's Kath & Kim from 2008 to 2009 and on the TBS animated series Neighbors from Hell. Throughout Shannon's career she has appeared in a number of films in supporting roles.

In early 2010, Shannon was cast in a recurring role on the Fox television series Glee as Brenda Castle, an astronomy and badminton teacher who has a rivalry with main character Sue Sylvester.

She returned to Saturday Night Live for a special Mother's Day episode on May 8, 2010 and also the October 2010 reunion special "Women of SNL".

Shannon replaced Katie Finneran in the role of Marge McDougall in the Broadway revival of Promises, Promises and remained through its closure in 2011, along with co-stars Sean Hayes and Kristin Chenoweth.

Shannon's first children's book, Tilly the Trickster, was released September 1, 2011.

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