Just read about it in the new tv guide.

Gibson will play a cop in the upcoming episode, in which father Keith Carradine tries to dissuade his sons from riding motorcycles. "He shows us, a video of a cop from like the 1970's telling you why motorcycle riding is bad" reveals Erik Von Detten, who plays Chris. "Mel's the cop.He's got a little mustache, It's hilarious"

The episode will most likely air during November Sweeps.