Loyalty to the King (S02E03)

After Finn and Jake rescue yet another princess from the Ice King's clutches, Ice King decides it's time for a dramatic change. So, he shaves off his beard and becomes the "Nice King," Ooo's most eligible bachelor! Not even Finn and Jake recognize the Ice King without his beard, and they vow to serve and protect his every whim. Oh, this can't be good... (iTunes)