Cheyenne Mountain is a mountain that houses a secret military base. It appeared in Season Four episode "Trapper Keeper".
Background
With Cartman's Trapper Keeper taking over Cartman himself and his computer, it began to make its way to Cheyenne Mountain, where it absorbed a super-computer stationed there. The Trapper Keeper started engulfing more objects, but when it swallowed Rosie O'Donnell, it became sick, allowing Kyle to remove its CPU and destroy the Trapper Keeper for good.
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