Cecius was a Human male lieutenant of the Imperial Navy during the Galactic Civil War. A native of the planet Vogel 7 and formerly of the Imperial Army, Cecius served as a bridge officer aboard Darth Vader's personal flagship, the Super Star Destroyer Executor. As a specialist in boarding tactics and the seizing of enemy starships, Cecius was given command of the capture of Luke Skywalker and the crew of the Rebel freighter, the Millennium Falcon, during their escape from Imperial forces on Cloud City in 3 ABY, though his duties were nullified when the Rebel ship unexpectedly escaped into hyperspace.