Adventure Time - 202 - Loyalty to the King/Blood Under the Skin

Season 2, Episode 2A: Loyalty to the King
Finn and Jake pledge to serve the new "Nice King" who has come to Ooo, but they soon realize that he looks suspiciously like someone else they know.

Season 2, Episode 2B: Blood Under the Skin
When some knights mock his lack of armor, Finn must endure a series of embarrassing trials on his quest to get the Magical Armor of Zelderon.