 Most of the first series' characters were dropped, and the setting changed from a prison dimension to a space station.The new series was more vibrant than its predecessor, with jauntier opening titles, a brighter set and a new lead character; though this character retained the name Mercator, the character changed to a younger, more manic man with spiky hair, played by Christopher Wild.New characters including Zee, Dr. Kovan and Brian the Dinosaur were introduced, replacing the supporting characters from the previous run.