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Star Trek's Lost 20th Century Spin-Off Revealed
25 Aug
Summary
- An Original Series episode aimed to launch a 20th-century spin-off.
- Gary Seven and Roberta Lincoln were to headline the new series.
- The planned 20th-century spin-off ultimately never materialized.

A surprising revelation from "Star Trek: The Original Series" indicates a planned spin-off that never reached fruition. The Season 2 finale episode, titled "Assignment: Earth," was designed to introduce characters and a premise for a new series set in the 20th century.
This specific episode saw the starship Enterprise traveling back in time. There, they encountered Gary Seven and his feline companion, Isis. Seven's mission was to interfere with historical events, leading to conflict with the Enterprise crew, though both sought to protect Earth.
Gary Seven, along with another character named Roberta Lincoln, were specifically created for this potential series. However, despite this careful introduction to audiences, the 20th-century-based spin-off show was ultimately never produced, remaining a footnote in Star Trek history.