Rigger (リッガー Riggā) was a Kaiju that appeared in episode 32 of Ultraseven.
Subtitle: Mechanism Monster (メカニズム怪獣 Mekanizumu Kaijū)
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 Guard 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 Guard 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 Guard.
- Rigger was created from a heavily modified Dinosaur Tank suit.
- Rigger's roar is a reused Zaragas roar.
- Rigger is one of the monsters that makes up Belyudra's left arm in Mega Monster Battle: Ultra Galaxy Legends 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.
- Originally, Pagos was to appear in Rigger's place until being replaced by said monster for unknown reasons.
- 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. However, it is implied that they were behind the plot to bomb the TDF base.
- 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.
- Length: 60 m
- Weight: 65,000 t
- Origin: Asteroid Din
- Powers and Weapons
- Tail: Rigger's main weapon is its powerful tail, which can be used to whip or constrict enemies.
- Asteroid Din: Rigger's method of transportation is a massive, levitating island asteroid which serves as a saucer. The saucer's guidance system originates in Rigger itself, as shown by its head being used to change the saucer's course.
- Electromagnetic Waves: Rigger's saucer asteroid constantly emits powerful electromagnetic waves capable of disrupting both human technology and Ultra transformation items.
- Time Bomb: The asteroid is a time bomb that could completely destroy the TDF's base if it collided.