A trouble making boy named Phineas and his friend Irving sneak into the local gentalmen's club and unwittingly bet against arrogant billionare Heinz Doofenshmirtz that they can travel around the world in 80 days, with the prize of $1,000,000. After "borrowing" a hot air baloon, they begin their journey. Along the way they rescue a beautiful princess named Isabella from an unwillful marriage. Meanwhile Doofenshmirtz follows the kids to delay them, so he can win the bet.