The scientist known as Dr Cylo commanded a personal legion of marines stationed on his whale fleet. During the invasion of Cylo's flagship by Darth Vader, Dr Aphra, and her squad, a number of these marines perished. As part of a scheme to depose Emperor Palpatine, these troops fought against Imperial forces when Cylo attempted hijacking of the Super Star Destroyer Executor. Aboard Cylo's second flagship, which subsequently crashed into a star, resulting in Cylo's death, Lord Vader eliminated the remaining marines under Cylo's command.