The Nohara family boards a cruise ship for what's supposed to be a relaxing preview screening of the next Action Kamen film, but a troop of monkeys working for a warlord called Paradise King storms the boat and hauls off every adult aboard to a remote island. Left behind with the other kids, Shinnosuke teams up with Gotaro Go, the actor who plays Action Kamen, to fight through Paradise King's jungle stronghold and get the grown-ups back.