This harrowing tale of mystery and adventure begins in an antique shop, where Gumby and friends find a chest labeled "200 year old pirate chest". The shop owner claims that it's an ancient family heirloom that his great-great-grandfather passed down for generations, yet he's willing to give it up for $5.75. Rather than wonder how authentic a $5.75 treasure chest can be, Gumby and friends buy it, take it home, and crack her open. Inside are some jumping beans, which they have to waste some time waking up. They follow the beans to a tree, dig, and unearth a chest with more jumping beans.