|This article is about a/an monster in Kamen Rider, the original series.|
Gamaguiler (ガマギラー Gamagirā, 34, Rider vs Shocker) – A toad monster. His personal emblem was a silhouette of his own head. He was able to release nerve gas and fought with a chain weapon. He was tasked with killing Dr. Origuchi as well as his witness, Kinuko, and destroying the documents connected to Shocker's secrets. Kamen Rider 2 cut through a Cessna airplane which exploded afterward with Gamaguiler inside with his Rider Jump. Gamaguiler made a brief return appearance in the monster army of the Kamen Rider vs. Shocker movie but did not actually have an active participation there.