Star Trek: Phase II was the initial working title for what officially became titled Star Trek II, an unproduced American science fiction television series created by Gene Roddenberry as a sequel to the original Star Trek, which had run from 1966 to 1969. The plans for the series were first developed after several failed attempts to create a feature film based on the property, coupled with plans for a Paramount Television Service (PTS) as a fourth broadcast television network in the United States.

Eugene Wesley Roddenberry Sr. was an American television screenwriter and producer who created the science fiction franchise Star Trek. Born in El Paso, Texas, Roddenberry grew up in Los Angeles, where his father was a police officer. Roddenberry flew 89 combat missions in the Army Air Forces during World War II and worked as a commercial pilot after the war. Later, he joined the Los Angeles Police Department and began to write for television.