Confirming previous reports about the finale, UPN's synopsis of the episode confirms that Earth will be attacked by a strange new alien foe and the NX-01 sent on a mission to find the culprits and prevent the ultimate destruction of Earth by venturing inside a Bermuda Triangle-like region of space.

"In the season finale, Earth is savagely attacked by a mysterious alien probe that leaves millions of people killed. When Archer learns that the culprit species is planning to destroy the entire planet with their next assault, Enterprise embarks on a new mission into the dangerous and highly mysterious Delphic Expanse to put a stop to it. Although T'Pol is given a direct order from the Vulcan High Command not to participate in this mission, she resigns her post in order to continue with Enterprise. Meanwhile, the Klingons, who are bent on destroying Archer, continue their hot pursuit of Enterprise all the way into the expanse."

The episode wrapped production Monday under the direction of veteran Allan Kroeker, from a script by producers Rick Berman and Brannon Braga. The episode is slated to air May 21st on UPN.

The network has also released its official synopsis for "Bounty," the second-to-last episode of the season airing in a double-billing May 14th.

"After contracting a virus on an away mission, T'Pol begins to prematurely experience severe symptoms of Pon Farr, the Vulcan mating cycle in which she has to mate or else die. She begins to make advances on Phlox as well as Reed in her burning desire to mate, forcing the crew to find a solution. Meanwhile, Archer is kidnapped by a bounty hunter who has been hired by the Klingons to bring him back to their planet where a bounty has been put on his head for escaping from their prison."

"Bounty" was directed by Roxann Dawson from a script by Mike Sussman, Phyllis Strong and Hans Tobeason.