Slithergee

Slithergee were a species who had the ability to exude guilt and pity. For this reason, Slithergee often worked in the hospitality sector. (AUDIO: The Memory Box)

Orval Ignashus was one such Slithergee. Ignashus worked as manager of the Galileo Spotel. When the trillionaire Berkley Silver was assassinated in his Penthouse Suite, Ignashus had no choice but to put the spotel into lockdown as per galactic protocol. (AUDIO: The Memory Box)

Behind the Scenes
The Slithergee were first introduced in the Big Finish Doctor Who audio story Flip-Flop before going on to star in many more. According to these stories, the Slithergee were blind alien slugs whose homeworld had been destroyed. More can be read over at the Tardis Data Core.