The Venture Bros. (2004)

S4E9 The Diving Bell vs. The Butter-Glider

Brock, Hank, and Dean embark on an extraordinary journey inside Rusty's mind to uncover the cause of his coma. At the same time, Henchman 21 is pressing for new henchsuits, but the Monarch is too preoccupied with his latest obsession: a butter-glider he just acquired.