Happy Endings is about to ID the guy (at least partly) responsible for Penny’s considerable man issues: her dad!

The ABC comedy has tapped former universe controller Andy Richter to play Casey Wilson’s (relatively young) onscreen father, TVLine has learned exclusively.

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Conan O’Brien’s longtime sidekick will appear in a spring episode that I’m told will address the pair’s relatively tiny age difference (Richer is only 14 years older than Wilson).

According to an insider, Richter’s Roy and Megan Mullally’s Dana had Penny when they were really, really, really, really young.

Roy reappears in his daughter’s life as things are getting very serious between her and first-ever steady beau Pete (Nick Zano).

What do you think of the casting? Thumbs up? Thumbs down? Thumbs sideways?