To impress a beautiful girl, Harold Kelp, the grandson of professor Julius Kelp, who created a potion to transform his personality, gets his hands on his grandfather's secret elixir and unleashes his destructive alter ego, Jack.
as Harold Kelp/Jack Love
as Professor Julius Kelp / Buddy Love
as Robin
as Zeke/Waiter/Fear/Ned
as Begews
as Dean Von Wu
as Brad/Tad
as Polly
as Suzy Perkins
