The Forbidden Mine, Part 1 + 2
S3, E42: Gumby's got a surprise for his friends - a picnic at the edge of the Grand Canyon. After their lunch they decide to go exploring and come across an abandoned mine.

S3, E42: Gumby's got a surprise for his friends - a picnic at the edge of the Grand Canyon. After their lunch they decide to go exploring and come across an abandoned mine.