Episode:103
One of Our Planets Is Missing

Jack's Rating:

The Enterprise encounters a giant cloud creature that feeds on the energy of the planets that lie in its path. They determine it is heading for Mantilles, home to a Federation colony governed by former Starfleet officer Bob Wesley (featured in the TOS episode "The Ultimate Computer)".

Features:
Stardate: 5371.3
Air Date: 09/22/73
Director: Hal Sutherland