While wacky inventor Conrad (John Callen) works on a new type of airship, the kid campers of Treasure Island search for a missing boy and discover an alien. After making friends with the extraterrestrial, Miranda (Sasha Tilley) and Charlie (Nicko Vella) try to protect it from scientists. This third installment of the family-friendly adventure series also stars Beth Allen, Keith Adams and Katherine Kennard.