American Dad! S10 E11 Cock of the Sleepwalk

"From the creator of "Family Guy" comes a man who will stop at nothing to protect his country."

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.