Watch a sneak peek of "So What's the Purpose of the Platypus?"

Doug's relationship with Maggie (special guest star Kathy Baker) kicks into high gear, with a wedding date already set. But their plans hit a snag when Maggie is attacked by an unknown assailant at Louie's. Leon Cooley's execution date is just around the corner, and Johnny and Rhetta are desperately trying to save him through a letter-writing campaign. Clay decides to join in the efforts after he befriends Leon's son, Ben (Lost's Malcolm David Kelley). But a video surfaces that may destroy their chances.

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