Lore (Star Trek)
In the fictional Star Trek universe, Lore is the name of a prototype for the android Data, often referred to as his 'evil brother' and was played by the same actor: Brent Spiner.
Lore was built on Omicron Theta after B-4, but before Data, by Dr. Noonien Soong. It is unclear whether Lore's personality defects arise from errors in his design, or from his having more "human" features than Data, but regardless, Dr. Soong felt it necessary to deactivate and disassemble Lore. Before being disassembled, Lore contacted the Crystalline entity, which destroyed the entire colony.
In 2364, Data discovered his "brother" Lore, and Dr. Beverly Crusher led the team that reassembled him. However, Lore's psychopathic tendencies soon became evident: he deactivated Data in an attempt to take over the Enterprise. Lore was transported off into space just before he had a chance to kill anyone. ("Datalore")
In 2367, Dr. Soong summoned Data to a planet, and Lore also came to confront Dr. Soong. ("Brothers").
In 2730, Lore ran into a group of Borg who had been cut off from the collective. Lore became their leader for a while, and tried to get Data to help him on the endeavor. Eventually, the group of Borg rejected Lore's leadership. Data finally dismantled Lore for good, but kept Lore's emotion chip.
The special effects that allowed the Lore and Data to appear in the same frame were quite sophisticated. In one scene Lore puts down a glass of wine which Data then picks up. This was achieved by the use of a moving split screen.