Star Trek: Phase II...

Never completed, the pilot was rehashed as the film "Star Trek: The motion Picture" and several proposed episodes were used later as TNG episodes ("The Child", "Devil's Due")

Star Trek: Phase II was a planned television series based on the characters of Gene Roddenberry's Star Trek, which had run from 1966 to 1969. It was set to air in early 1978 on a proposed Paramount Television Service (a precursor/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.

Several attempts at a Star Trek motion picture were made in the 1970s, including Gene Roddenberry's 1975 treatment The God Thing, and a later attempt called Planet of the Titans, which proceeded to script stage to be abandoned in 1977. It was decided instead to create a new Star Trek television series, for a new national television network to be owned by Paramount. This was announced on June 17, 1977 with a projected start date of February 1978.

Pre-production work started, with sets built, several television grade models (including the Enterprise itself and many of the pilot episode's models) made, deals made to bring back most of the original series cast, and several actors cast. It was planned to use the original series uniforms. Principal photography had not started, but test footage had been shot. Story writing had proceeded to thirteen scripts, enough for a half-season.

Work on the series came to an end when the proposed Paramount Television Service folded. However, following the success of the science fiction movies Star Wars and Close Encounters of the Third Kind, the planned pilot episode entitled "In Thy Image" was adapted into a theatrical production, Star Trek: The Motion Picture.

Several minutes of test footage, including a view of a redesigned Engineering Room, costume tests with crew, screen test footage of David Gautreaux as Xon and costume test footage of Persis Khambatta as Ilia, were included in a featurette on the DVD release of the Directors Edition of Star Trek: The Motion Picture.