Numm

The Numm were a technologically-primitive sentient species Han Solo and Chewbacca encountered after the Millennium Falcon 's hyperdrive malfunctioned, forcing them to land on the Numm's world. The Numm feared CZ-4, the droid Han and Chewie were tasked with delivering as a gift from Boonda to Jabba Desilijic Tiure. After CZ-4's disappearance, the duo discovered the Numm's fear of droids resulted from a band of Krath war droids which had terrorized them since the droids crashed on the Numm's world centuries ago. The war droids' leader, known as the Blade Master, abducted CZ-4 to cannibalize for spare parts, but Han and Chewbacca were able to reprogram the war droids, saving CZ-4 (and likely their own lives, as well, since the loss of the gift droid would have angered the Hutts) and ending the Numm's oppression. The grateful Numm then led Han and Chewie to a freighter wreck, from which the pair were able to repair the Falcon and depart to complete their delivery.