Goop

Goop is the Omnitrix's DNA sample of a Polymorph from the planet Viscosia.

Appearance
Goop is a humanoid pile of goo that can take any shape.

He has an Anti-Gravity Projector that allows him to be mobile in Earth's gravity. The device also projects his voice.

In Alien Force/Ultimate Alien, Goop wears the Omnitrix/Ultimatrix symbol on his chest.

In Ben 10: Omniverse, Goop has a nose-like beak and he has an amoeba-like shape. The anti-gravity projector is redesigned, and the Omnitrix symbol is now on the top of the projector. When Goop speaks now, a crackle of static is heard at the end of each line as if he is speaking through a walkie-talkie.

Powers and Abilities
Goop controls his slime with his Anti-Gravity Projector, if Goop and the Anti-Gravity Projector are separated by at least two feet, Goop's body will become inert until the Anti-Gravity Projector recollects it.

Goop's Anti-Gravity Projector allows Goop to take any shape and fly.

Goop can manipulate his Anti-Gravity Projector to fly away and cut enemies.

In Vilgax Attacks, Goop can throw a blob of goo at the enemy, spray acid from his hand like a hose, and spin his feet around to damage nearby enemies.

If Goop loses his Anti-Gravity Projector when going through an obstacle, the Omnitrix /Ultimatrix can create a new one instantly.

Goop is able to fire slime with acidic or sticky properties upon impact.

Goop can use his acid like properties to dissolve nearly anything.

Weaknesses
Goop is limited to his Anti-Gravity Projector controlling his body. If it is separated by two feet, more or turned off, Goop's body goes completely inert.

It is shown Goop can be hurt by being spun really fast.

In Alien Force/Ultimate Alien, because of his slime body, the Omnitrix/Ultimatrix can be easily pulled off, reverting Goop to normal and decoupling the Omnitrix/Ultimatrix from the user. In Omniverse, the Omnitrix is on the Anti-Gravity Projector, which eliminates this weakness.

Alien Force

 * Goop first appeared in The Gauntlet, to defeat Techadon.
 * In Darkstar Rising, Goop battled Magister Gilhil.
 * In Good Copy, Bad Copy, Negative Goop was roaming around a computer store. Goop battled Negative Humungousaur.
 * In Undercover, Goop saved Cooper from some DNAliens.
 * In Birds of a Feather, Goop helped Simian escape from some guards.
 * In Vengeance of Vilgax: Part 2, Goop escaped from the Omnitrix and hid in the sewers. He battled Swampfire before getting reabsorbed.
 * In Fool's Gold, Goop appeared to battle Mayor Coleman.
 * In Simple, Goop was used to avoid getting hurt after being pushed off a cliff.
 * In Vreedle, Vreedle, Goop battled the Vreedle Brothers.
 * In Single-Handed, Ben turns into Goop while Julie is using his hand as a weapon, disgusting her.
 * In In Charm's Way, Goop battled Charmcaster's rock monsters.
 * In Primus, Ben turned Vilgax into Goop and pulled the Omnitrix off his chest, removing the Omnitrix from Vilgax.
 * In Above and Beyond, Goop defeated Pierce.

Ultimate Alien

 * Goop returned to Ultimate Alien in Andreas’ Fault, Goop escaped a dungeon cell.
 * In Hero Time, Goop saved Julie from falling.
 * In Deep, Goop failed to escape some fans until Gwen saved him. Goop used his Anti-Gravity Disk to save Piscciss. Although Goop was atomized and spread throughout the planet's water, he survived and was able to pull Piscciss back together.
 * In Nor Iron Bars a Cage, Goop escaped a locked room and unlocked the door to let Gwen out.
 * In Viktor: The Spoils, Goop appeared as King Xarion was looking through the Ultimatrix for AmpFibian.
 * In Revenge of the Swarm, Goop battled the Victor Validus clones. As soon as Goop tried to catch him, Victor escaped.
 * In The Creature From Beyond, Goop saved Gwen and Kevin.
 * In Ben 10,000 Returns, Goop battled Eon's servants.
 * In Greetings From Techadon, Goop battled the yellow Techadon robot.
 * In The Perfect Girlfriend, Goop was defeated by Ssserpent.
 * In Catch a Falling Star, Goop was used to break into the motel room of Carl Nesmith and Jennifer Nocturne.
 * In Night of the Living Nightmare, Goop was used to battle Vilgax.
 * In The Beginning of the End, Goop was used to defeat the Forever Knights.

Omniverse

 * Goop returned to Omniverse in Blukic And Driba Go To Mr. Smoothy's where he battled Trumbipulor.

Ben 10 Alien Force: (Video Game)
Goop is a playable alien character in the game (DS only).

Ben 10 Alien Force: Vilgax Attacks
Goop is a playable alien in the game.

Ben 10 Alien Force: The Rise of Hex
Goop is a playable alien in the game.

Appearances
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Ben 10: Alien Force

 * The Gauntlet (first appearance)
 * Darkstar Rising
 * Good Copy, Bad Copy (used by Albedo and Ben)
 * Undercover
 * Birds of a Feather
 * Vengeance of Vilgax: Part 2 (escaped)
 * Fool's Gold
 * Simple
 * Don't Fear the Repo
 * Single-Handed
 * In Charm's Way (accidental transformation, selected alien was Way Big)
 * Primus (used by Vilgax)
 * Above and Beyond

Ben 10: Ultimate Alien

 * Andreas’ Fault (first re-appearance)
 * Hero Time
 * Deep (x2)
 * Nor Iron Bars a Cage
 * Viktor: The Spoils (cameo; unconscious)
 * Revenge of the Swarm
 * The Creature From Beyond
 * Ben 10,000 Returns (intended alien was Rath)
 * Greetings From Techadon
 * The Perfect Girlfriend
 * Catch a Falling Star (cameo)
 * Night of the Living Nightmare (Dream)
 * The Beginning of the End

Ben 10: Omniverse

 * Blukic And Driba Go To Mr. Smoothy's (first re-appearance)

Video Games

 * Ben 10: Alien Force (Video Game) (DS only)
 * Ben 10 Alien Force: Vilgax Attacks}}

Trivia

 * According to Dwayne, Goop is a single celled organism.
 * Goop's Anti-Gravity Projector isn't part of Polymorph biology; this is due to the difference of gravity between Viscosia and Earth.
 * Although he can shapeshift, Goop's humanoid state appears to be his "default" shape.
 * Goop is one of the 5 aliens who escaped the Omnitrix; the others are Ghostfreak, Way Big, Chromastone and Spidermonkey.
 * Goop's Anti-Gravity Projector became a substitute for the missing Anti-Gravity Multiplier on planet Piscciss.
 * Goop's voice is similar to that of Stinkfly.
 * In The Beginning of the End, Goop believes his voice prevents others from taking him seriously.
 * In Omniverse, when Goop speaks, he sounds like he is talking through a radio.