Episode Title:You Forgot Your Floaties.Episode Description:Finn and Jake try to rescue Magic Man's new apprentice, Betty (voiced by Lena Dunham), but Magic Man stops them. Betty and Magic Man then create a system that will make Magic Man the new "globhead", allowing him to assume the position once held by his brother, Grob Gob Glob Grod. The two have a vision about an artificial intelligence that Magic Man created, called M.A.R.G.L.E.S., named after his dead wife who was taken by the entity Golb. M.A.R.G.L.E.S. was designed to be used as a weapon to stop Golb. A mishap, however, caused M.A.R.G.L.E.S. to severally damage Magic Man's brain. In the end, the magical procedure goes awry, and Betty absorbs Magic Man's powers, leaving him normal.