Event Horizon

The year is 2047 and a ship named the Event Horizon has re-appeared after disappearing seven years prior, in experiments for faster-than-light travel. A rescue vessel hastily speeds to the returned vessel after a transmission is picked up from the ship, garbled but vaguely resembling a human voice. As the crew reaches the ship and spends longer on it, it appears that someone or something is toying with them, and more, the question is what has the Event Horizon become?