A touch of Saturday Night Live is coming to Glee.

Molly Shannon will guest star this May on the musical comedy, playing a role that sounds almost too delicious to be true.

Originally reported by EW.com and then backed up by E! News, Shannon will portray Brenda Castle. She'll be a nemesis for Sue and:

"[A] busty 45-year old new astronomy teacher and badminton coach at McKinley high-school who is both an alcoholic and a pill-popper," said an insider.

Ignoring the atrocity that was Kath & Kim, Shannon has appeared on episodes of Pushing Daisies and 30 Rock.

Glee (fianlly!) returns to Fox on April 13.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.