The twelfth episode of the Original Series
A mega space wasp captures the Protector and flies it to its home world nest. There it buries the ship and lays a multitude of eggs on the hull. Not wanting to become insect food, the Commander and crew device a way to kill the deadly insect and destroy its rapidly developing spawn.
This episode mentioned, or at least touches upon Commander Taggarts history as a navigator about the NSEA Explorer, and how he was promoted to commander after he saved the entire Explorer crew in a deadly encounter with the asteroid beast of Numbus 9. At the time nobody realized the creature was actually a small child looking for his pet comet.