'Glee': Molly Shannon cast as Sue Sylvester's nemesis

molly-shannon-320.jpg "Glee" won't return to your TV sets for another two months, but the cast, crew and casting directors are hard at work.

The latest? They've landed "Saturday Night Live" supa-stah Molly Shannon.

FOX confirms that Shannon will join the cast for an episode in May, playing a teacher and coach at McKinley High.

Word is she's got some substance-abuse issues and a serious rivalry with Jane Lynch's Sue Sylvester.

Here's to hoping she takes some of the heat off Mr. Schu.

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