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M5-BZ (also reffered as Beezee) was an R4-series astromech droid who served with Jedi Master Tera Sinube during the Clone Wars, before being assigned to D-Squad, under Colonel Meebur Gascon. He served as Gascon's base of operations.
M5-BZ was one of the few droids to go on a misson to get a ecription mondule. He was hollowed for Gascon to travel in. He helped Gascon to get through the Separatits forces on the ship.