Stage: London, England
This giant rocket always appears as the boss of the London stage, no matter when the stage is encountered in the game. Similar to the large rocket holding Pandora or Osaru in other games, Rocket V3 falls apart as it blasts upward; the various parts attack the player with fireballs. This rocket has no core, unlike those that contain major bosses; it is defeated when the player destroys its nose.
Rocket V3 is probably based on the V-2 rockets, German missiles fired at London (among other targets) during World War II. While work was begun on a V-3 cannon by the Germans, it was not completed, and there was no real-life V-3 missile.