The Killacopter is the sub-boss of Mission 5. It is a heavily-armed transport helicopter that drops enemies and launches several types of missiles. After enough enemies have been defeated, it will retreat.
It reappears in Mission 6, where it attempts to push the player into a pit with the wind of its blades and is fought again. It uses a new missile attack and turns upside-down to cut the player with its blades, dealing extreme damage (although also damaging any enemies that happen to be in its way). After the battle, it retreats again.
It appears for the last time at the end of Mission 6 to assist the boss Giant Tank. When the Giant Tank is defeated, its main cannon will inadvertently blast the Killacopter and destroy it; the Giant Tank is then destroyed by the falling Killacopter wreckage.
- The Killacopter is a reimagined version of a miniboss from the NES version of Double Dragon II: The Revenge colloquially known as the Heavycopter.