|Home world:||Asteroid Din|
|First appearance:||Ultraseven Episode 32 "The Wandering Planet" (1968)|
|Latest appearance:||Ultraman Taro Episode 25 "Burn On! The Six Ultra Brothers" (animated flashback)|
|Affiliation:||Beryudora (body part)|
Subtitle: Mechanism Monster (メカニズム怪獣, Mekanizumu Kaijū?)
- Length: 60 m
- Weight: 65,000 t
- Origin: Asteroid Din
Rigger was a kaiju that had thrived on an asteroid-like saucer that was headed for earth that possessed and emitted Electromagnetic Waves. When the Ultra Garrison left to deal with the asteroid, it pulled their ships onto its surface and downed them as it landed. Shortly after scoping out the area and discovering the saucer's origins, Rigger appeared and attacked them. As the Ultra Garrison tried to hold the monster off with their weapons, Dan tried to transform into Ultraseven. However due to the saucer's electromagnetic field, the Ultra Eye would not activate.
Instead, Dan tried to hold off the monster with his newly introduced capsule monster, Agira. Agira was left to battle Rigger on his own while Dan Moroboshi went to dismantle the source of the electromagnetic waves. Agira and Rigger seemed evenly matched but once Rigger downed Agira at an opening, Agira was left to feel the battering of Rigger's tail which forced Dan to recall Agira before any worse harm could be done. Once the electromagnetic fields were disabled, Dan transformed into Ultraseven and battled the monster himself. Ultraseven and Rigger also seemed evenly matched by ultimately it was the ultra who won by decapitating Rigger with his Eye Slugger. Shortly after killing the monster, Ultraseven lured his ship into the Earth's Atmosphere with Rigger's decapitated head, where it exploded thanks to a bomb that was implanted insides its core thanks to the Ultra Garrison.
- Rigger was created from a heavily modified Dinosaur Tank suit.
- Rigger's roar is a reused Zaragas roar.
- Although not physically seen, Rigger is one of the monsters that makes up Beryudora's left arm in Mega Monster Battle: Ultra Galaxy Legend The Movie.
- In the middle-to-late 1990s, footage of Rigger was used for the TNT, TBS and Cartoon Network show Cartoon Planet. Rigger footage was used to the reclusive Mist Dragon in the recurring sketch entitled 'Vacation Spots of the Universe' that would feature special Ultraseven locations being advertised by Space Ghost on Cartoon Planet. In the featured location, Rigger's saucer was called the Flying Island.
- Rigger was seen in an animated flashback as part of Alien Empera's monster army in Episode 25 of Ultraman Taro.
- Rigger was originally meant to be controlled by an alien race called the Alien Mandala (マンダラ星人 Mandara Seijin?), they were eventually cut.
- In an unused script for episode 32 of Ultraman, it details that the artificial planet of Dine was created by a race called the Alien Mandalas and was on a collision course for Earth.
Powers and Weapons
- Saucer: Rigger can travel via a saucer.