Godzilla Junior episode 3 (the last)

After the events of the second episode, the dragon sits on a volcano and absorbs the lava, turning into Infrigate, a fire Kaiju. Godzilla Jr. escapes from the dragon's trap and goes to battle. Infrigate wins and eats the younger one, Godzilla Jr. absorbs Infriger's lava, becoming burning, he defeats Infriger, absorbs his radiation, but soon Godzilla Jr. realizes his mistake - he will soon explode, his nuclear heart overheated, he moves away so as not to harm anyone