Miclas made his debut appearance fighting against the Alien Pitt bioweapon, Eleking. The two monsters fought each other fiercely as the UG tried to make it to the scene and while Dan tried to retrieve his Ultra Eye (which had been stolen by the Pitt Aliens) but after a lengthy battle, Eleking gained the advantage by electrocuting him with his tail, weakening Miclas. Dan then called Miclas back into his capsule for his safety.

Miclas was used once again to fight the monster Gandar as Dan had lost the Ultra Eye in the snow created by Gandar. Miclas fought valiantly against Gandar but the fierce weather conditions and Gandar's ice breath was too much to handle and became paralyzed after a combination of both that and his time running out. Once Gandar was killed off by Ultraseven, Miclas was called back into his capsule. Since then, Miclas would be greatly remembered by his master as a heroic monster.