Rivesh Mantilax worked in genetic warfare for his kind, and the designer of a genatic weapon that would kill all Viperox in the universe, which the Doctor objected to. When the Viperox went to war with his kind, his side lost. His wife Seruba Velak had already crashed in Roswell. As soon as he could Rivesh went to find her, his ship was gunned down by the US Military near Area 51. He was saved by a Native American called Night Eagle. There he hid in a cave for four years. Night Eagle took the Doctor to see him he told the Doctor and the Doctor's friends his story. Just moments after that, General Stark walked in and attempted to arrest him.
He locked him up in Dreamland, seperated from Seruba Velak by a panel of glass. Just as his enemy Lord Azlok escaped from the Area 51 base he was attacked by him. Serbua and the Doctor later went on a search to look for a cure to revive him, located in Seruba Velak's ship. They were sucessful in their mission and arrived in the Tardis, which was delivered by Jimmy and Cassie. Seruba revived Rivesh and he activated the device, which the doctor modified with his Sonic Screwdriver to emit a high pitched noise, amplified by the Tardis, that could only be heard by Viperox. They fled the Earth back to Viperon, with Rivesh and his wife able to return to their home. (DW: Dreamland)