The homeworld of the fish-like Antedeans, a planet under consideration for Federation membership in 2365 when two of its delegates set out to bomb the Pacifica conference.
Antede III is the home planet of the Antedeans, an aquatic-looking species who find space travel so distressing that they make journeys in a self-induced catatonic state. It features in the second-season Next Generation episode Manhunt.
In 2365 the Enterprise-D collects two Antedean dignitaries from the planet to carry them to a conference on Pacifica, where Antede III's entry into the Federation is to be discussed. The pair are beamed aboard rigid and unconscious, along with a large tank of the vermicula they will eat on waking.
When they revive and prepare to leave the ship, Lwaxana Troi, also a passenger, remarks offhandedly that they are assassins. A search shows that their robes are lined with the explosive ultritium, and they are taken into custody.