The Spider Slayers

Alistair Smythe was the son of Spencer Smythe, inventor of the Spider-Slayers - a series of robots designed to destroy Spider-Man. The initial generation of Spider-Slayers were created by Alistair's father and commissioned by J. Jonah Jameson. After Spencer failed to kill Spider-Man - and ended up getting destroyed as a result - Alistair inherited the legacy from his father and gained a new-found hatred toward Spider-Man. He initially worked for the Kingpin but left in disagreement over how to deal with Spider-Man and went solo.
Ultimate Spider-Slayer

After being confined in an asylum, Alistair released himself and took several other inmates with him in order to construct a new series of Spider-Slayers that tracked Spider-Man across the city. His plan of revenge forced the inmates to assist in the machines' construction. After sending a series of slayers after Spider-Man, Alistair lured Spider-Man to his residence for one final battle.

In order to defeat Spider-Man on his own, Alistair enhanced himself by encasing his entire body in a biorganic carapace that not only served as a full body armor, but increased his strength and gave him the ability to walk again by interconnecting with his spine. The physical structure of the carapace gave Alistair bird-like talons for feet, a long, curved blade-like weapon jutting from each shoulder, a pair of smaller jagged blade weapons on each forearm, and a specially made web-shooter that fired from the forearm area. Eventually, Spider-Man defeated Alistair and made sure he and the surviving asylum inmates were taken to custody.