Mark I
Appearing at the Daily Bugle scientist Spencer Smythe offered his services to the publisher J. Jonah Jameson, claiming his Spider-Slayer could capture Spider-Man. At first dismissive of Smythe, Jameson is convinced to use the robot by Peter Parker (Spider-Man's civilian identity) who believed the Slayer could be easily defeated. Activating and using the machine via remote Jameson used it to stalk Spider-Man (the Slayer's sensors being made to home in on arachnid signatures) through New York, it was able to climb walls and Spider-Man's webbing slid of it, it eventually ensnaring him in the Slayer's coils. Despite being trapped Spider-Man managed to tamper with the Slayer's circuitry, forcibly shutting it down. He then fools Jameson with an empty costume.
Several days after defeating the Slayer Peter visited Smythe's laboratory, prompting the inert Slayer to spring to life and attack him. Before Smythe could deduce he is Spider-Man, Peter removed a jar of spiders from his pocket, claiming they were responsible for the robot attacking him, fooling Smythe, who deactivated the Slayer. When the newly created Molten Man trashes Smythe's lab (knocking the scientist out) the Slayer activated again and attacks Peter, who cuts off the devices power supply with his webbing before Smythe can regain consciousness.
Years later the Slayer would somehow fall into the hands of the villainous technopath the Reanimator, who added it to his collection of machinery. During a battle with Wolverine the Reanimator activated the Spider-Slayer Mark I and had it attack the hero, who easily defeated it.
A replica of the Spider-Slayer was built by Alistair Smythe and destroyed by Spider-Man, who would go on to relive his first battle with the original Slayer after being flung back in time.
J. Jonah Jameson would reacquire the Slayer at some point, keeping it stored in his attic. During a dinner to get to know his new daughter-in-law, the She-Hulk, various issues come to a head. Jameson snaps and using the Slayer (rechristening it the "She-Hulk Slayer") battles the She-Hulk inside his own house, damaging it severely. She-Hulk swiftly demolishes the robot.
The Mark I was covered in a special chemical coating which stopped Spider-Man's webbing and clinging abilities from working against it. The Spider-Slayer could also scale vertical surfaces and it also possessed several tentacles and coils which it could use to ensnare enemies. It was equipped with a special sensor device that homed in a target which possessed 'spider-impulses'. As a result, it will chase and ensnare anything and anyone with the greatest amount of these characteristics (which in most cases, is Spider-Man). The robot is basically humanoid in form and has a large monitor in the head which displays the operator, namely J. Jonah Jameson.
Read more about this topic: List Of Spider-Slayers
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