Defeated by Goldar, Rodak concentrates on examining the structure of Goldar and his component parts to find the Space Avenger’s weakness. Tom Mura and his family have decided that a vacation is in order. While flying in a jet airliner, the plane suddenly sways. But it is not turbulence…the plane’s instruments do not function because of some outside disturbance. A strange saucer is seen flying outside the plane, then leaves the area. Tom meets with another UPI reporter named Kita, and together they investigate the whereabouts of the flying saucer. The saucer is located and turns out to be a small glowing mechanism that appears to be breathing! The object is brought back to the lab as scientists try to discover its origin. Not having the right equipment for further tests, the object is shipped by truck to another facility. On the back of the truck, the object begins to grow. As it crushes the truck with its increasing mass, the object changes into a new creature of Rodak’s: Birdaurus (Birdora)!