A scientist and old friend of Captain Dan; Dr. Warp, escapes from Doppler's grasp. Captain Dan takes off in the 'not quite ready' Sky Arrow to save him as his friend is being hunted down by a Doppler robot squadron. Captain Dan and Dr. Warp's planes are forced down on an island by the Doppler squadron. Takuma and Bunta set off to rescue them. Does Dr. Warp have secret information on Doppler's plans for Promete?