Cal Alder was a Human male lieutenant of the Alliance to Restore the Republic during the Galactic Civil War. A highly-trained, expert scout from the Outer Rim Territories planet Kal'Shebbol, Alder served with Major Bren Derlin for many years during some of the Rebel Alliance's most dangerous operations of the war before receiving assignment to the Alliance High Command headquarters of Echo Base on the ice planet Hoth by 3 ABY.