Working within the little-seen industrial sectors of Cloud City are several Ugnaught communities. Hardy workers, Ugnaughts are short porcine aliens well suited to the harsh conditions found in the Tibanna gas-mining colony.
The head Ugnaught worker put in charge of readying the carbon freezing chamber for use on humans was Ugloste. The weary old Ugnaught had lived much of his life as a slave. Before he came to the relative freedom of Cloud City, he had toiled away for humans. It was with little compunction that he made the modifications to freeze Han Solo in carbonite.
The character of Ugloste, the chief Ugnaught, was played by actor Jack Purvis, who also played the chief Jawa in A New Hope, and Teebo the Ewok in Return of the Jedi.