Subtitle: Plastic Phantom (プラスチック怪人 Purasuchikku Kaijn)
Alien Platic first appeared with his fan-like drill underground after it was detected, but soon got away after the latest Ultra Guard member tried to glorify himself. Later that day he managed to hijack the TDF MRI with four tanks and went on a rampage. With the tanks shortly destroyed by the Ultra Guard, Dan sneaked aboard, but was seemingly knocked out by Alien Platic until he turned into Ultraseven. The two of them grew much larger and battled, but after being tossed Alien Platic seemingly surrendered until Ultraseven turned around and was petrified. Alien Platic continued his attack when Ultraseven became unpetrified and destroyed his drill with the Emerium Ray. After some time of fighting both fighters became very exhausted and could barely crawl until Ultraseven tossed Alien Platic and destroyed his body with the Emerium Ray. Later on his skeletal form was killed by a shot from a dying Ultra Guard member.
- Magazines released at the time of the episode's release stated that Planet Platic is made entirely of plastic.
- Although not physically seen, Alien Platic is one of the monsters that makes up Belyudra's left arm in Mega Monster Battle: Ultra Galaxy Legends The Movie.
- Height: 40 m
- Weight: 15,000 t
- Origin: Planet Platic
- Powers and Weapons
- Drill: Alien Platic can control a giant fan-like drill similar to the Ultra Guard's TDF MRI. This vehicle launches grenades and can petrify pilots.
- Petrify Mist: Alien Platic can release a mist from his "mouth" that petrifies enemies on contacted, however, this mist only has a limited amount of time on Ultras.
- Extraordinary Jumper: Alien Platic can jump far distances.
- Skeleton: Alien Platic can revive himself in a skeletal form.