M-3PO-C was owned by Arviz Linden and used as his secretary. Linden kept the plant's production at a minimum to protect the Sekct, a species native to the planet, and M-3PO-C admired him for that. The droid was dismayed upon learning of his death. After Vost Tyne and the Empire overtook Marca, M-3PO-C was reassigned to managing the housekeeping droids at the plant. When Alliance agents crashed on Marca and decided to help the native Sekct, M-3PO-C happily assisted the agents while they were on the planet.