The Stalker class was a type of fighter developed by the Caitians for Starfleet in the 25th century. This fighter often used as auxiliary craft for Atrox-class carrier. The Stalker stealth fighter was a small warp-capable ship. Primarily designed as a stealth fighter, the Stalker's energy signature is very low and it is hard to detect at long distances until it attacks. (STO video game: Star Trek Online)