Mister Act

Peter's Valentine's gift of an exercise bike proves a success with Lois, who trains hard and builds muscle. Peter injures himself on the machine, which leaves him with a high singing voice, and the pastor recruits him for the church choir. The other singers resent being overshadowed, so Peter takes instruction from Jesus and beats them, until a falling crucifix restores his old voice. Stewie, taken with his mother's new figure, reads her attention at a parent and toddler class as flirtation and is allowed into her bed. His attempt to repeat the evening fails, because Lois has already given up the bike and lost the muscle.