Titanosaurus and Megalon were under mind control of the Xilians and had no will. This was until Gigan came from out of nowhere and attacked Planet X. Gigan trashed the planet completely until he destroyed some of the underground labs, causing Titanosaurus and Megalon to break free. Titanosaurus and Megalon got to the surface and saw Gigan and one another. Gigan's mission briefing told him nothing of encountering other monsters and took them both as enemies.

 

Gamera arrived just before they were about to get at each other's throats. Gigan took Gamera as an enemy and launched his chest cables at him, piercing the reptile's chest and dragging him towards Gigan's buzzsaw of terror. Titanosaurus saw his opprotunity and threw a boulder at Gigan's head. The bird like cyborg turned around and used his beam to hit Titanosaurus in the chest. Megalon used a napalm bomb from his mouth and went for Gamera, who was trying to unhook himself from Gigan's cables. Gamera launched a fire ball at Megalon, sending him towards the ground. Wanting to get back at Gigan, Gamera took to the air and rammed into him. Gigan cried out as he fell to the ground. He got off the ground and tried to flee from Gamera. The atlantean turtle would not let his enemy escape with ease and soon followed.

 

Meanwhile, Titanosaurus used his cyclone tail to attack Megalon on the ground. Megalon took the amphibious reptile by suprise when he used his horn beam and made Titanosauru flinch. However, he wasn't going to allow the cockroach god of Seatopia beat him. Titanosaurus started punching at Megalon with both fists. Megalon took several hits until he delivered a napalm bomb to Titanosaurus' face. The water monster cried out in pain and moved very violently. His tail accidently hit Megalon, knocking him to the ground in the process. Megalon fired a napalm bomb at Titanosaurus' feet, knocking him on his back. Megalon used his horn beam on the fallen dinosaur for payback. The giant roach then fled as Titanosaurus would soon catch up.

 

With Gamera pursiuing Gigan on the desert alien world, the cyborg from beyond space landed and attacked Gamera using his cluster beam. The giant turtle had been struck with great force and crashed onto the planet surface. He roared as he got back up, letting Gigan know the fight isn't going to end just yet. Gigan roared in anger and charged at his foe. Both of them engaged in combat. Gamera delivered Gigan punch after punch with Gigan trying to use his arms as blunt objects into Gamera's face. Both were getting head trama from each others' blows. Gigan used his cluster beam, hurting Gamera. The gigantic atlantean turtle returned the blow by kicking Gigan's knee, knocking him down. Without warning, Gamera delivered an uppercut. Gigan used his left arm and tried to jam it in Gamera's mouth.

 

Suddenly, Megalon fired a napalm bomb at the two monsters, knocking them away from each other. Gigan used his cluster beam on Megalon and used his cables to impale the giant roach. Titanosaurus came out of nowhere and slammed on Gamera before he got back up. Titanosaurus kept kicking Gamera in the chest, but Gamera's shell was too thick for the kicks to do much to him. Using a fire ball, he knocked Titanosaurus on his back, leaving a burn mark on the dinosaur's chest. Gamera retracted his legs and blasted off right into Titanosaurus. The red reptile punched Gamera in his eyes, making them both crash to the ground. Gamera was no fully focused on his new advisary. Gamera began to engage Titanosaurus in hand-to-hand combat.

 

Meanwhile, Megalon is about to meet his doom as Gigan is about to butcher him up into pieces with his buzzsaw abdoman. Not willing to give up, he uses his horn beam on Gigan's chest cables, detatching thm. Megalon roared with victory. Gigan then did a hook punch into Megalon's left eye. The cockroach god shrieked in pain. Megalon then kicked his mechanical foe a few hundred feet. Gigan flew towards him at high speeds, sending Megalon far. The giant bug cried out in terror as his cybernetic foe was about to win. Once down and looking unconcious, Megalon looked dead. When Gigan looked over to confirm it, Megalon suddenly used his horn beam into Gigan's rubic eye. Gigan shrieked in pain as he could no longer see. Megalon used four napalm bombs on Gigan. Megalon used his horn beam and destroyed Gigan's buzzsaw edges. The cybernetic creature was no threat to him as he kicked Gigan to the ground and moved on.

 

Gamera and Titanosaurus were still locked in combat with one another. Titanosaurus used his cyclone tail to keep Gamera busy as much as possible. Gamera covered his eyes and head as rocks were crashing into his head from the cyclone. Titanosaurus saw his chance and gave Gamera an uppercut. Gamera retrated his legs and took off into the air. Using a fire ball, he severly injured his enemy and knocked him to the ground.

 

Megalon made his way to the battlefront to get in on the action. Gamera did not want more trouble and started aiming at Megalon. Gamera fired two fire balls at Megalon. The first discarted Megalon's body and deformed his face. The second fire ball destroyed his entire lower half. Gamera fired a third, which blew him to pieces for good.

 

Titanosaurus saw his opprotunity and threw a rock at Gamera's head. The rock hit with great force, the giant shelled reptile roared in pain. Gamera turned around to fight Titanosaurus. The giant dinosaur threw another  rock at his air borne enemy, but missed instead. Gamera fire another fire ball at Titanosaurus, knocking him to the ground fast. Gamera landed on the ground. Titanosaurus charged at Gamera and sent him flying a few thousand feet. The giant Atlantian could no longer take it. He summoned what mana he could get from Planet X. Titanosaurus saw in amazment as golden ring clouds were making their way to his enemy. Titanosaurus ran towards Gamera, trying to stop what was going to happen. It was too late as Gamera's chest opens up and unleashes his famous mana beam. Titanosaurus is not only sent flying, but is destroyed as well, proving Gamera is the victor as the crimson dinosaur's pieces fell to the surface of the desert alien world. Gamera roared with victory.

 

The fight was not yet over as a blind Gigan was still twitching with power, but only enough to kill Gamera or retreat. Gigan flew at his enemy with amazing speed. Gamera was getting tired as he chucked a fire ball at Gigan, blowing his chest up and sending him to the ground. Gamera fired another, blowing off Gigans arms in the process. The cybernetic monster collapsed on his back.

 

Gigan was barely alive as Gamera walked towards him and looked at the helpless machine. Gamera could not stand Gigan suffering and fired one last fire ball to end it. Gigan blew up. This would mean Space Hunter M Aliens and the Xilians would go to war, but nowhere near Earth.

 

Gamera could finally return to Earth, where he could go back into the ocean and rest.