Lore

Lore was a Soong-type android from Omicron Theta built by Doctor Noonian and Juliana Soong. He was eventually dismantled and put into storage for malevolent behavior. In 2364, he was reactivated by the Enterprise-D before attempting to have the ship destroyed by the Crystalline Entity. His brother Data soon deactivated him again and left him adrift in space.

Two years later, Lore was reactivated by a passing Pakled ship. Later again, at a forced reunion between he, Data and Noonian Soong, Lore stole an emotion chip intended for his brother.

In 2369, Lore instilled himself as leader of group of Borg disconnected by the hive mind. He attempted to modify and use the drones to create a master race. After luring Data and the Enterprise-D to his own devices, his plans were quickly foiled and he was dismantled again.

In 2377, in a radical move, Starfleet cybernetics expert Terence Epstein stole the Lore parts and reassembled them, reactivating Lore in-shuttle, on escape from the Federation. Soon later, Lore discovered Fendaus V, a planet full of Mudd androids, and took his place as leader of them in an attempt to return to his plans of instilling a master race. In 2388, with the help of the Nanites from Kavis Alpha IV, the USS Phoenix-X foiled Lore's plans before he could use Omega molecules to destroy Earth. Thanks to the Nanites, Lore's remote connectivity functions were damaged and he was forced to beam out somewhere unknown in escape. (: "Cybernetic Showdown")