Star Trek: Phase II, also known as Star Trek II, was a planned television series based on the characters of Gene Roddenberry's Star Trek, which had run from 1966 to 1969. The new series was set to air in early 1978 on a proposed Paramount Television Service (a forerunner to UPN). The series was to follow the adventures of the Enterprise crew on a second five-year mission, and be a continuation of the Star Trek franchise.