Derek (24 Carat)

A Tetrap called Derek proposed a line of "bubble-trap bath" products to Melanie Bush, on behalf of the Tetraps, and he threatened to liquify and feed her to the hatchlings if she refused. Mel alerted security, and Derek ran off. (WC: 24 Carat)

Behind the scenes

 * Richard Gauntlett, who plays Derek, had previously played Urak the Tetrap in Time and the Rani.