The Return of Monte Cristo(1946)

The grandson of Edmond Dantes was cheated out of his fortune and falsely imprisoned, only to escape and wreak vengeance on his betrayers by assuming the guise of the Count of Monte Cristo. Just like grandpa, the younger Dantes is framed by a trio of connivers and shipped off to Devil's Island. Escaping with a fellow convict, political radical Bombelles, Dantes adopts the bearded guise of an elderly man in order to destroy his enemies and reclaim his birthright.