"One of Our Planets Is Missing" is the third episode of the first season of the animated American science fiction television series Star Trek.
It first aired in the NBC Saturday morning lineup on September 22, 1973, and was written by veteran Star Trek director Marc Daniels.
[1] In this episode, the Enterprise must contend with a massive space cloud that eats planets, now targeting a Federation colony of over 82 million inhabitants.
They determine it is heading for Mantilles, home to a Federation colony governed by retired Starfleet officer Robert Wesley.
[note 2] Captain Kirk contacts Wesley, but he has only enough time and starships to evacuate a tiny fraction of the planet's children.