The Bullwinkle Show

Rocky & Bullwinkle - Upsidaisium (15) - The Train on the Plain or The Overland Express (2x71)

Air date: Nov 12, 1960

Bullwinkle inherits an upsidaisium mine in a mountain that flies because upsidaisium is an anti-gravity metal. The nation needs upsidaisium, so Bullwinkle and Rocky fly the mountain to Washington. Thwarting them at every turn are Mojave Max and Death Valley Dotty.