The Missile Boat was an advanced Imperial starfighter designed by Admiral Thrawn and built by Cygnus Spaceworks. Designed as a countermeasure against the rogue Grand Admiral Demetrius Zaarin and his supply of TIE Defenders, the Missile Boat was a descendant of the Alpha-class Xg-1 Star Wing, also manufactured by Cygnus Spaceworks. The Missile Boat relied primarily on warheads for dogfighting and assaults, a notable difference from other Imperial starfighters, which relied more heavily on laser cannons. The Missile Boat also included an innovative propulsion feature known as the SubLight Acceleration Motor (SLAM).
The Missile Boat loosely resembled the general body style of its predecessor, the Alpha-class Xg-1 Star Wing. The Missile Boat had a bulky profile in comparison to the Star Wing, yet both models shared a pronounced fuselage with dorsal stabilizer, flanked by the craft's primary warhead launchers. The Missile Boat's second set of warhead launchers extended from pylons attached to the dorsal surface of the primary launchers. This secondary set rested at an angle reflexive to the lateral wings.