Stream Adventure Time Season 5, Episode 21 instantly on NOW

Finn and Jake are excited when Princess Bubblegum invites them to help her collect samples in the Desert of Wonders. When their vessel is attacked by nasty goo monsters Finn and Jake start to think the mission has been sabotaged by PB's robot helper James./Root Beer Guy works a boring job during the day and tries to write mystery stories at night, but his life is about to change when he witnesses Finn and Jake kidnapping Princess Bubblegum! There's only one problem: no one believes Root Beer Guy...