The Best of Bonanza S2 Ep 10 The Last Viking
Gunnar is a long-lost relative of the Cartwright family. When Gunnar arrives at the Ponderosa, the family takes him in for the evening.

Gunnar is the brother to one of Ben Cartwright's late wives. Unbeknownst to the Cartwright family, Gunnar is also the leader of a band of criminals called The Comancheros.

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