Abner Ronald Jenkins, also known as the Beetle, MACH-1, MACH-2, MACH-3, MACH-IV, MACH-V, MACH-VII and MACH-X, is a character appearing in American comic books published by Marvel Comics. Created by writer Stan Lee and artist Carl Burgos, he debuted in Strange Tales #123 as the original Beetle, a supervillain wearing an armor plated, mechanical suit he had designed himself after growing frustrated with his ordinary job as an aircraft mechanic and deciding to turn to crime. Although in his first appearance he fought the Human Torch and the Thing of the Fantastic Four, later storylines established Jenkins as a recurring foe of Spider-Man, usually working as a henchman for various criminal organizations opposing the hero. Jenkins later formed his own criminal organization known as the Sinister Syndicate.

The Sinister Syndicate is a group of supervillains appearing in American comic books published by Marvel Comics. The characters serve as a collection of lesser-known Spider-Man villains. The group was the focus of the 1991 Deadly Foes of Spider-Man mini-series.