Wikipedia
Upsidaisium (story arc)
Upsidaisium is the first story arc from the second season of Rocky and His Friends. With 36 segments it was the second-longest of all Rocky and Bullwinkle story arcs, and concerns Rocky and Bullwinkle's efforts to reclaim Bullwinkle's Uncle's Upsidaisium mine. It was broadcast on ABC during the 1960–1961 television season on Sundays, concurrently with Metal-Munching Mice on Thursdays.