|This article is about a/an kaijin in Kamen Rider X.|
He was destroyed by the X Kick.
An aquatic cyborg, Neptune could function both in sea and on land. He possessed the ability to spew foam-like bubbles from his mouth that would cause instant death upon contact with humans, reducing them to skeletons. Befitting his motif, Neptune wielded a trident as his weapon.
- Footage of Neptune's defeat by Kamen Rider X appeared in the TV special Birth of the 10th! Kamen Riders All Together!! (1984), in a recap of the ten Kamen Riders.
- Kamen Rider X
- Birth of the 10th! Kamen Riders All Together!! (recap; archive footage only)
|Redizer - Perfecter - Ridol - Mercury Circuit - Cruiser|
|Tōbei Tachibana - Chiko - Mako - Kiriko Mizuki - Ryoko Mizuki - Keitaro Jin|
|Takeshi Hongo - Hayato Ichimonji - Shiro Kazami - Joji Yuki|
|Government of Darkness|
|King Dark - G.O.D. General Commander - Dr. Noroi|
|Apollo Geist - G.O.D. Warfare Agents|
|Neptune - Pannic - Hercules - Medusa - Cyclops - Bull Man Minotaur - Birdman Icarus - Mighty Atlas - Mach Achilles - Flaming Prometheus - Hydra - Chimera - Ulysses - Reaper Chronos - Cerberus - Alseides - Cateus|
|Ogle-Dagger - Salamander-Gong - Ghengis Khan-Condor - Toad-Goemon - Scorpion-Geronimo - Horned Beetle-Lupin - Franken Bat - Starfish-Hitler - Spider-Napoleon - Chameleon-Phantom - Leech Dracula - Lizard-Viking - Ant Capone - Centipede Youkihi - Tiger Nero - Scorpion-Geronimo Jr.|
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