Spider-Man: Super Villain Smackdown is a game idea of mine. It involves two stories like Sonic Adventure 2.
Peter Parker wakes up and rushes outside. Green Goblin, Beetle, Kraven, Electro, Sandman, Doctor Octopus, Mysterio, Shocker and Lizard jump out from the SHIELD Helicarrier. He quickly becomes Spider-Man and jumps on. Fury explains to him and his team that Goblin and Beetle broke into the helicarrier and busted the other six out. He assigns Wolverine, Captain America, Hulk, Iron Man and Thor to help stop the eight of them.
Iron Fist and Spider-Man use their bikes to chase Electro through Manhattan and Spider-Man defeats him at Midtown's roof, but he hyper-electrifies himself and crushes him. Iron Fist then fights him supercharged at a bugle billboard and wins, but Electro turns into electricity and escapes.
Later, Beetle is pursued by Nova and Iron Man and is defeated by Nova at a construction site, but he is frightned by bunnies created by Mysterio's illusions. Iron Man then pursues him to a museum to obtain the Tablet of Order and Chaos, but is defeated.
Afterwards, Power Man finds Shocker stealing Giga power-ups and stops him. Captain America takes down Doctor Octopus' arms and Octobots, while Shocker paralyses Power Man and escapes with the sample. Green Goblin later robs Oscorp blind for his taser suit and is caught by Spider-Man. They fight on a rooftop, with Harry watching and Sandman fights him after Goblin escapes.
That night, Harry breaks into a building owned by Empire State University and is challenged by Eddie Brock. The symbiote Harry was trying to steal grabs onto Eddie, but Harry pulls two pieces of it off, one of which joins to him, the other is exposed to radiation and falls out of a window. Brock, possessed by Venom and bonded permanently to the symbiote attacks Harry in a black Spider-Man suit and Harry eventually escapes out.
Meanwhile, Wolverine challenges Shocker along with Hulk and he eventually loses track. Hulk finds himself fighting Sandman, of which he defeats him by reducing him to mud. At the same time, Venom attacks Spider-Man in a construction site and Harry assists by fighting Carnage, during which Gwen gets involved. Harry defeats Carnage and Gwen is sent home.
The next day, Gwen suffers from a disease from Carnage when suddenly realizes she has gained slightly stronger and no longer needs to wear glasses. When Peter asks her she says nothing is wrong and soon develops a new Spider-Girl costume, during which of a test she is attacked by Spider-Woman. Later, Black Cat joins Peter chase down Lizard, who has captured and trapped many people in the sewers and is turning them into lizards. Kraven turns the Lizard into an even more monstrous form, which Spider-Man fights while Black Cat pursues Kraven and defeats him, though he puts her to sleep with tranquilizer darts.
Thor later meets Spider-Girl and she defeats the Tri-Sentinal created by Loki who Thor takes down. They are all present when Green Goblin supercharges himself into Hulk Goblin and puts on the taser suit with Electric Gloves. Spider-Man defeats Doctor Octopus, White Tiger defeats Kraven, Power Man defeats Shocker, Iron Fist defeats Electro, Nova defeats Beetle, Captain America defeats Lizard, Iron Man defeats Mysterio, Thor defeats Sandman, Hulk defeats Hulk Goblin, Spider-Girl defeats Spider-Woman, Harry defeats Venom and Wolverine defeats Carnage. Venom, Carnage and Spider-Woman are reverted to normal as the symbiotes escape and the rest are taken for study.
Green Goblin attacks the SHIELD Helicarrier and Beetle releases the security locks, releasing Doctor Octopus, Sandman, Electro, Mysterio, Kraven the Hunter and Shocker, then escaping the helicarrier. Goblin takes Curt, which Doctor Octopus injects with lizard serum, becoming the Lizard.
Beetle and Sandman attack a pier of which Thor and Power Man interrupt. Beetle defeats Thor while Sandman defeats Power Man and they build a base there. Electro later defeats Captain America and takes over a power plant, becoming hyper-charged and defeating Wolverine.
Continuing of Harry's story from Hero, Eddie Brock becomes Venom and the radio-active symbiote lands on crook Cletus Kasady, turning him into Carnage. He then captures passing by citizen Gwen Stacy and joins up with Venom against Spider-Man. Harry fights Carnage and wins, knocking him down but Venom defeats Spider-Man, but plunges under a ton of cement when Carnage lands on him. However, Carnage had tried to absorb Gwen before Harry stopped him.
Carnage later arrives at a bell tower, where Mary Jane Watson is praying for Peter's death, believing he killed her aunt. His body rips and a part of Carnage lands in Mary Jane's hair, genetically altering it to give her Spider-Man's powers and turning her evil. She then wreaks havoc on the city and defeats Spider-Girl.
Spider-Woman later fights Iron Fist while Kraven duels White Tiger. After they win, Kraven takes Ava's White Tiger Amulet and goes to aid Lizard. Lizard later assists Shocker in defeating Power Man and Black Cat.
They are all present when Green Goblin turns into Hulk Goblin. Doctor Octopus defeats Spider-Man, Kraven defeats White Tiger, Shocker defeats Power Man, Electro defeats Iron Fist, Beetle defeats Nova, Lizard defeats Captain America, Mysterio defeats Iron Man, Sandman defeats Thor, Hulk Goblin defeats Hulk, Venom defeats Harry, Carnage defeats Wolverine and Spider-Woman defeats Spider-Girl. Venom then absorbs Harry, Carnage and Spider-Woman's hair altering to turn her back to normal and Venom becomes huge. Sandman and Venom then merge with Hulk Goblin and he crushes the others, though Mary Jane, regained her sanity, escapes.
- Spider-Man/Peter Parker (Tobey Maigure)
- White Tiger/Ava Ayala (Caitlyn Taylor Love)
- Power Man/Luke Cage (Ogie Banks)
- Iron Fist/Danny Rand (Greg Cipes)
- Nova/Sam Alexander (Logan Miller)
- Captain America/Steven Rogers (Roger Craig Smith)
- Iron Man/Tony Stark (Adrian Pasdar)
- Thor (Travis Willingham)
- Hulk/Bruce Banner (Fred Tatasciore)
- Wolverine/James Howlett (Steven Blum)
- Black Cat/Felicia Hardy (Tricia Helfer)
- Spider-Girl/Gwen Stacy (Lacey Chabert)
- Green Goblin/Norman Osborn (Steven Blum/Steven Weber)
- Electro/Max Dillon (/Christopher Daniel Barnes)
- Sandman/Flint Marko (Thomas Haden Church)
- Doctor Octopus/Otto Octavius (Alfred Molina)
- Mysterio/Quentin Beck (David Kaye)
- Kraven the Hunter/Sergei Kravinoff (Diedrich Bader)
- Beetle (Steven Blum)
- Shocker/Herman Schultz (Jeff Bennett)
- Lizard/Curt Connors (Dee Bradley Baker)
- Venom/Eddie Brock (Benjamin Diskin/Matt Lanter)
- Spider-Woman/Mary Jane Watson (Vanessa Marshall)