Spider-Man helped to fight the Sinister Syndicate who got away. The Sinister Syndicate crashes the trial of Boomerang where Partridge brought up people to talk about Boomerang leading him to think that Patrtrige sold him out. Speed Demon begins a relationship with Leila. Beetle eventually betrayed Boomerang by allowing him to be caught during a robbery and then convincing him to use Beetle's lawyer Steve Partridge, not knowing that Beetle had instructed his lawyer to throw the trial to ensure Boomerang's conviction. The four-issue mini-series focused upon the group's break-up due to the Beetle's jealousy towards Boomerang and his attempts to usurp control over the group. The group, now featuring getaway driver/Boomerang's girlfriend Leila Davis, were the focus of the 1991 mini-series Deadly Foes of Spider-Man. Despite some difficulty, Spider-Man and Silver Sable were able to repel them with the help of Sandman.

The Sinister Syndicate first mission has them successfully preventing Spider-Man and Silver Sable from capturing famed assassin Jason Macendale, then known as Jack O'Lantern. Unlike the Sinister Six, which was formed mainly to destroy Spider-Man, the Syndicate was formed to act as a mercenary group that worked for the highest bidder. The original roster of the group consisted of Beetle, Hydro-Man, Rhino, Boomerang, and Speed Demon, who collectively gathered together under the Beetle's leadership. Patterned after the conglomeration of Spider-Man's deadliest foes who call themselves the Sinister Six, the Sinister Syndicate originally was formed by the super-villain Beetle. The Sinister Syndicate first appeared in The Amazing Spider-Man #280 and was created by Tom DeFalco and Ron Frenz. The group was the focus of the 1991 Deadly Foes of Spider-Man mini-series.

The characters serve as a collection of lesser-known Spider-Man villains. The Sinister Syndicate is a group of supervillains appearing in American comic books published by Marvel Comics. Fictional comic book supervillain group Sinister Syndicate

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