While in Canada Timmy and Lassie encounter a downed hot air ballonist. By accident they end up in the balloon which takes them into the wilderness. The young boy and his dog must find a way to survive even fending off a wild pig.

• June Lockhart
• Jon Provost
• Bob Howard
• Richard Kiel
• Walter Stocker
• Hugh Reilly
• Will J. White
• Patrick Waltz