"Horizon" is the twentieth episode of the second season of the science fiction television series Star Trek: Enterprise, and originally aired on April 16, 2003, on UPN. The episode was written by André Bormanis and directed by James A. Contner. The episode's guest stars included Nicole Forester, who had previously appeared in Star Trek: Deep Space Nine; Joan Pringle; and Corey Mendell Parker. Set in the 22nd century, the series follows the adventures of the first Starfleet starship Enterprise, registration NX-01. When the ship detours to observe volcanic activity on a planet, Ensign Mayweather (Anthony Montgomery) takes the opportunity to visit his family on board the E.C.S. Horizon. Montgomery had previously suggested the appearance of Mayweather's parents at the end of season one, and was pleased to see them introduced. Several sets to create the Horizon were created on a soundstage, with the related scenes filmed in the second half of the episode's shoot after the main cast were dismissed, with the exception of Montgomery. Critical response was mixed, and the episode received the lowest ratings for a first-run episode of the series so far, viewed by 3.36 million viewers. Plot At the direction of Starfleet, Enterprise makes a detour to a planet passing between two gas giants in order to observe the gravitational forces and subsequent volcanic activity. Their new course takes the ship close to that of E.C.S. Horizon, the cargo vessel where Ensign Mayweather grew up. He requests permission for a further detour to rejoin his family on Horizon, as his father is ill and he hasn't been able to visit him in four years. Captain Archer readily agrees, but bad news arrives when Mayweather learns that his father died some six weeks earlier. As planned, Mayweather boards Horizon and receives a warm welcome from most of the crew, including his mother Rianna. He finds that his brother, Paul, has been named acting captain, but he doesn't seem to be coping well with his new responsibilities. Mayweather offers to make a few repairs and upgrades to systems on the ship, but Paul tells him to stop, making him feel uneasy and out of place. Soon afterward the ship comes under attack, and a homing device is placed on the hull. Mayweather then recommends a boost in the ship's fighting capability, but Paul insists that the safest course is to flee to the nearest port and yield the