Eleking was a monster born and raised by two twin sisters, who let him loose on the earth after stealing Dan's Ultra Eye, which prevented him from assuming his Ultraseven form. Once the twin sisters, known as the Alien Pitts, arrived on Earth they donned the guises of human girls. When one of them was observing the lake she was caught by two members of the UG and a fisherman. As she tried to escape them she released tadpole Eleking into the water, allowing the other Alien Pitt to summon him when the time was needed.

With Ultraseven nowhere in sight, Eleking was free to wreak havoc. Luckily, Dan released Miclas, one of his Capsule Monsters, to fight and hopefully distract Eleking while he chased after the sisters to retrieve his Ultra Eye. The two monsters battled fiercely in the lake and soon brought the battle to land. Miclas, however, was eventually defeated by Eleking's long, whip tail, as well as his electric shock powers. After Miclas failed to defeat Eleking, all seemed lost until Dan finally managed to retrieve the Eye by chasing the sisters to their hideout, a large spaceship, from which they controlled Eleking.