The Urbankans were green-skinned humanoids with lumpy features and clawed hands. They were bald with lumpy features and two bumps above their eyes. They could secrete a deadly poison out of glands on their necks that would compress organic matter. (TV: Four to Doomsday) One trillionth of a gramme could reduce a humanoid to the size of a grain of salt. (PROSE: Four to Doomsday)