It is a near-mindless duplicate of Spider-Man with a vicious, animal-like mind who primarily acts as a servant to other villains rather than having a full will of its own.

Along with Peter Parker's agility, speed, and power to cling to walls, the Spider-Doppelganger possesses greater strength, six arms, talons, and organic web-spinnerets on each forearm that fire "razor-sharp" webbing.

The issue featured multiple superheroes being attacked by demonic doubles (referred to as doppelgängers), mutated and sent by the series villain Magus.

Spider-Man's battle is unseen, but it is shown that his personal double (which the hero later refers to as the "Spider-Doppelganger" or simply "the Doppelganger") winds up dead.

Separating from Demogoblin, the bestial Doppelganger eventually encounters the mass murderers Carnage and Shriek, the latter of whom adopts the creature as a loyal pet.

The creature comes to see Shriek as a mother and later defends her from attack by an enraged Carnage, who in turn delivers several fatal stab wounds to the Spider-Doppelganger before knocking it off a rooftop.

[4] Doppelganger turns up alive years later, now capable of some speech and with an altered appearance, its form apparently still malleable since it is of the Manifestation race.

After Shriek is finally freed from being held by authorities and the mental hospital Ravencroft Institute, she and the Doppelganger wreak new havoc on New York.

The Spider-Doppelganger is savage and largely unintelligent, seemingly limited to animal instinct, although it was capable of following basic instructions from its 'mother' Shriek.