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Hansford Rowe played Arthur Dupres
Arthur Dupres is married to Eleanor Dupres, Mike Donovan's mother. As his last name is not Donovan, it would appear he is Mike's stepfather.
Arthur is a businessman who operates the Richland Chemical Plant which receives a contract to make materials for the Visitors. In "The Final Battle", Arthur becomes frustrated with Eleanor's increased collaboration with the Visitors, and when she reaches the point where she becomes so corrupt she uses her grandson Sean to entrap Mike, Arthur becomes so disgusted he walks out the door, saying he is leaving her for good. Eleanor says "Once you go out that door, there's no coming back", to which Arthur responds "Thank God!", and left.
He makes no further appearances after this.