Pucumir Thryss, once a Tibanna gas miner, acted as a contact for the Rebellion residing on Cloud City. However, this was prior to its capture and subsequent control by the Galactic Empire. Seeking refuge from the Empire, he departed Bespin and sought shelter at Jabba's Palace. Thryss harbored a constant desire to go back to Cloud City and reclaim it.
During the events of 4 ABY, when Luke Skywalker and his companions arrived at the palace with the purpose to rescue Han Solo, Thryss observed with amusement as Skywalker faced the assault of Jabba's rancor.