the world is hollow and i have touched the sky?

best answer
For the World is Hollow and I Have Touched the Sky is the eighth episode of the third season of the American science fiction television series Star Trek. Written by Rik Vollaerts and directed by Tony Leader it was first broadcast on November 8 1968. In the episode the crew of the Enterprise rush to stop an asteroid from colliding with a Federation world but discover the asteroid is actually an inhabited ship.