Gamera had slain two kaiju by now, but currently he was resting, healing from his injuries sustained in his fight with Barugon. Both of his previous foes weren’t aquatic, as the first was airborne, while the second was terrestrial, so Gamera was only used to fighting aerial or land based opponents, as he had yet to fight an aquatic opponent, and soon that was going to change. From the depths of the ocean, the kaiju who Gamera would have to adapt to was prowling the sea, unlike the other two kaiju who Gamera fought, this kaiju, Zigra was an intelligent, sapient kaiju. Zigra swam through the sea, "If only that pathetic quote on quote saviour, would go into the water, and challenge me, because I’d give him a real fight!" he said. All the while Gamera rested in an underwater cave, however Zigra was actively searching for the cave, completely unknown to Gamera. After a few hours Zigra found the cave, and he attacked the resting Gamera, who hadn’t been expecting an attack, so he had to try fight back quick "YOU ARE DOOMED, GAMERA!" yelled Zigra. Gamera couldn’t use his fireballs underwater, so he had to claw and kick, both of which weren’t very effective against Zigra, Gamera truly was doomed, his best bet was to try escape now. Zigra had been victorious, proof to the troops of hell that Gamera could be beaten, things never looked bleaker for humanity, now that Gamera had lost against a kaiju, and hadn’t been seen following his battle with Zigra. However everyone knew Gamera wouldn’t give up this easily, he would have a rematch with Zigra, eventually. In the meantime everyone would have to wait, until Gamera would return to battle the egotistical monster and hopefully Gamera would adapt, and find a way to kill the opponent who bested him, after he was humanity’s last line of defence against evil, the fate of humanity was lying in his hands, so he could not let his loss against Zigra stop that, because Gamera was adapting to Zigra’s fighting style, he was gonna make sure Zigra and his ego were broken.
Daiei Films Gatekrashör for the music Me for the vector and this take c2a for the rest The design was inspired by some Zigra art I found on google