Morgan and his friends are on a hunting trip on a remote Canadian island when they are attacked by a swarm of giant wasps. Looking for help, Morgan stumbles across a barn inhabited by an enormous killer chicken. After doing some exploring, they discover the entire island is crawling with animals that have somehow grown to giant size. The most dangerous of all of these, however, are the rats, who are mobilizing to do battle with the human intruders.

Struggling to subsist on negligible and infrequent gold discoveries, prospector Ralph Logan crosses paths with Mazella, a New York City drifter with a three-wheel motorcycle and plenty of time on his hands. After introducing his new acquaintance to the practical but volatile Gladys, Logan suggests the trio join forces for a mission deep into the mountains of British Columbia in search of his father's elusive stash of gold.

Struggling to subsist on negligible and infrequent gold discoveries, prospector Ralph Logan crosses paths with Mazella, a New York City drifter with a three-wheel motorcycle and plenty of time on his hands. After introducing his new acquaintance to the practical but volatile Gladys, Logan suggests the trio join forces for a mission deep into the mountains of British Columbia in search of his father's elusive stash of gold.