Reruns are nothing new, but usually, the name of the show doesn't change. Bonanza is a unique exception. When the show was re-aired in 1972, the network decided to rename it after the ranch where the show took place, Ponderosa. Once the show was cancelled, though, reruns took the original name once again.
To make things more confusing, Ponderosa is also the name of a short-lived prequel that aired from 2001 to 2002.

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