Claude Picard

Younger brother of Starfleet Captain Jean-Luc Picard. Claude died when he fell into a well and broke his neck when he was six years old. Q once created an alternate timeline where Claude didn't die and went on to join a neo-Nazi organization which eventually took control of Starfleet, with Claude as supreme dictator. In this time, Starfleet had ravaged Vulcan and decimated the Betazoids, and enslaved the Andorians and the Benzites. Claude killed his brother when Jean-Luc was part of a Starfleet force that attempted to infiltrate the organization in 2352, and in 2367 destroyed the starship Enterprise-D which had been stolen by renegades Riker, Worf, LaForge, and Data. ("The Gift" [DC TNG vol. 2 Ann. #1]).