American Dad!

Season 10, Episode 11

Episode Title: Cock of the Sleepwalk

Air Date: 2014-01-26

Overview:

Stan mixes up his nighttime routine after his 100th kill, but mistakenly unleashes a "good" Stan in his sleep - Jekyll & Hyde-style - who's hell-bent on pursuing all the good deeds that real Stan would never consider, and stopping him from ever killing again.