Hundred Dollar Baby (S02E05)

After getting mugged, Dee agrees to take boxing lessons from Frank, who's thrilled with the prospect of reliving his glory days as a pro-fighter. Frank encounters his former nemesis at the old gym and gets the chance to rewrite their history. Meanwhile, Mac and Dennis hope to make some cash by entering Charlie in an underground street fight match, and Dee and Charlie dabble with performance enhancing supplements. (iTunes)