Mikko and Tom Mura hire a plane to take them to Balango Island, but the crew turn out to be Lugo Men. Mikko is given a sleeping pill by the stewardess, and then the pilots tell Tom that they work for Rodak. The Lugo Men disappear, leaving no one at the controls of the plane! Tom remembers Mikko’s whistle and blows it one time. Gam flies to their aid, and talks Mura in for a landing, guiding him in rocket form. Arriving on the island, the Muras and Gam meet Mary, the daughter of the scientist they were supposed to rendezvous with. Mary tells them her father has died. A guide leads them in search of the Balango seeds. The Lugo Men blow up a bridge, but Gam turns into a rocket and carries the heroes across. Going by foot into the jungle, they are met by Goldar, who tells Tom Mura that he must return to the city. Goldar leaves with Tom while Miko, Gam, Mary, and the guide continue their quest. They find the seeds in a cave which is guarded by Rodak’s monster, Drox!