The Antedean aide was part of a two man delegation that the Enterprise-D picked up from the newly discovered planet of Antede III. He and his companion were to be transported to Pacifica for a conference. He arrived while in a statis coma in order to ease the voyage. In reality he and the delegate were assassins who were going to detonate an explosion at the conference. They were exposed by Lwaxana Troi, who informed Picard that they had explosives hidden under their robes. (TNG: "Manhunt")
The Antedean dignitary was the leader of a delegation from the newly discovered planet of Antede III. The USS Enterprise-D was responsible for escorting the delegation to a Federation conference on Pacifica. The dignitary, as well as the rest of his delegation, was unaccustomed to space flight. To ease their voyage, they arrived on the ship in a self-induced catatonic state. Because the Antedeans awake from stasis with a voracious appetite, their food supply, a huge barrel teaming with a fish-like substance called vermicula, was beamed aboard the ship with them.
Lwaxana Troi, who was aboard the Enterprise-D during the Antedeans' three-day journey, used her telepathy to determine that the Antedeans were masquerading as delegates. They were, in fact, assassins who intended to blow up the conference site, using ultritium hidden in the lining of their ceremonial robes. After a detailed scan verified Lwaxana's allegations, Captain Jean-Luc Picard ordered that the Antedeans should be disarmed and held for questioning. (TNG: "Manhunt")