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Professor Goopton

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Goop Shopkeeper.png

Professor Goopton is an NPC that can be rescued from a cell in the Gungeon Proper or in the Oubliette. After being rescued, he will set up shops in the Gungeon, where he will sell goop-themed items and guns and has a x0.8 price discount. After purchasing something from his shop in the Gungeon, he will also move to The Breach, where new goop-themed items and guns can be unlocked with Hegemony Credit.png.

Unlike other NPCs, his dialogue will be written in an alien language - or rather, in the alien alphabet from Futurama. The Sponge grants players the ability to understand Goopton.

Items sold in the Gungeon[edit | edit source]

Icon Name Quote Type Notes
Abyssal Tentacle.png Abyssal Tentacle Look Away Beam Fires a tentacle that homes in on and grips enemies, damaging them.
Barrel.png Barrel Nothin' Easier Semiautomatic Fires fish that have a chance to stun enemies and leave pools of water.
Bubble Blaster.png Bubble Blaster The Suds Automatic Fires bubbles which move slowly towards enemies. Reloading the gun launches bubbles away from the player at high speed.
Compressed Air Tank.png Compressed Air Tank You Know My Work Charged Fires sharks that swim around the room, seeking enemies and biting them.
Fossilized Gun.png Fossilized Gun Proof That Guns Once Existed Beam Fires a stream of oil. Reloading causes the skull to spit fire, which can ignite the oil.
Gungeon Ant.png Gungeon Ant What Army? Semiautomatic Reloading alternates between firing spreads of bullets that leave behind oil and flaming bullets.
Mega Douser.png Mega Douser Contents Under Pressure Beam Fires a stream of water.
Mutation.png Mutation Didn't Need Two Anyway Beam Fires a continuous beam and heavily pushes back the player.
Plague Pistol.png Plague Pistol Chemical Warfare Semiautomatic Fires bullets that leave poison goop on the ground and have a chance to poison enemies.
Plunger.png Plunger Take Your Best Shot! Beam Fires a stream of poison. Has a chance to Poison enemies and leaves poisonous puddles on the floor.
Strafe Gun.png Strafe Gun Bleeding Edge Gameplay Automatic Fires nails that explode upon releasing the trigger.
The Membrane.png The Membrane Green Or Yellow? Semiautomatic Fires a shotgun blast of bouncing green bullets that split into more bouncing green bullets.
Icon Name Type Quote Effect
Bottle.png Bottle Active Heart Container Upon use, stores an extra heart or ammo pickup.
Bug Boots.png Bug Boots Passive Yikes! Dodge rolling leaves a trail of poison creep. Makes the player immune to poison.
Duct Tape.png Duct Tape Active Friend Of Gunsmiths Single use. Combines 2 guns by granting one gun the projectiles that the other gun fires.
Gundromeda Strain.png Gundromeda Strain Passive All Enemies Weaker! Decreases health of all enemies encountered.
Monster Blood.png Monster Blood Passive Twist To Open Taking damage spawns a pool of poison creep. Grants immunity to poison creep and a heart container.
Napalm Strike.png Napalm Strike Active Smells Great! Sets a large rectangular area on fire.
Poison Vial.png Poison Vial Active For External Use Only Creates a pool of poison creep.
Potion of Gun Friendship.png Potion of Gun Friendship Active Temporary +1 To Gun While active, increases all gun stats.
Potion of Lead Skin.png Potion of Lead Skin Active I'm Invincible! While active, the player reflects enemy bullets.
Sponge.png Sponge Passive Godliness Removes all liquids near the player.
Weird Egg.png Weird Egg Active Miracle of Gun Using the egg while missing health fully heals the player. Dropping the egg and shooting it spawns a gun, item, or yolk creature. Dropping the egg into fire spawns a serpent.

Items sold in The Breach[edit | edit source]

Icon Name Quote Type Clip Size Ammo Notes Cost
Plague Pistol.png Plague Pistol Chemical Warfare Semiautomatic 12 200 Fires bullets that leave poison goop on the ground and have a chance to poison enemies. 6 Hegemony Credit.png
Plunger.png Plunger Take Your Best Shot! Beam 500 500 Fires a stream of poison. Has a chance to Poison enemies and leaves poisonous puddles on the floor. 7 Hegemony Credit.png
The Membrane.png The Membrane Green Or Yellow? Semiautomatic 6 120 Fires a shotgun blast of bouncing green bullets that split into more bouncing green bullets. 10 Hegemony Credit.png
Fossilized Gun.png Fossilized Gun Proof That Guns Once Existed Beam 500 500 Fires a stream of oil. Reloading causes the skull to spit fire, which can ignite the oil. 12 Hegemony Credit.png
Abyssal Tentacle.png Abyssal Tentacle Look Away Beam 500 500 Fires a tentacle that homes in on and grips enemies, damaging them. 15 Hegemony Credit.png
Evolver.png Evolver Tamagunchi Semiautomatic Varies Varies Killing enemies evolves the gun through 6 forms. 35 Hegemony Credit.png
Icon Name Type Quote Effect Cost
Monster Blood.png Monster Blood Passive Twist To Open Taking damage spawns a pool of poison creep. Grants immunity to poison creep and a heart container. 5 Hegemony Credit.png
Bug Boots.png Bug Boots Passive Yikes! Dodge rolling leaves a trail of poison creep. Makes the player immune to poison. 7 Hegemony Credit.png
Sponge.png Sponge Passive Godliness Removes all liquids near the player. 6 Hegemony Credit.png
Napalm Strike.png Napalm Strike Active Smells Great! Sets a large rectangular area on fire. 18 Hegemony Credit.png
Gundromeda Strain.png Gundromeda Strain Passive All Enemies Weaker! Decreases health of all enemies encountered. 25 Hegemony Credit.png

Quotes[edit | edit source]

After being rescued:

  • "Thank you for rescuing me! My name is Professor Goopton. I came to the Gungeon to research the strange and mysterious goops that can be found here! I have long been a student of the Blobulonian Empire's technology. I followed them here, years ago, to see how their martial strategies would evolve in the Gungeon."

After leaving the cell:

  • "Thank you again. Hopefully, I will see you again soon!"

Entering his shop:

  • "Welcome, welcome!"
  • "Welcome! I have opened this small shop to continue my research."
  • "All proceeds will go toward funding my research!"

Purchasing an item:

  • "Thank you for your support!"
  • "Ah, you certainly have an eye for the viscous!"

Attempting to purchase an item without enough coins:

  • "I'm not sure you have enough Money.png for that..."

Talking to him:

  • "What are those monstrosities coming out of your body?"
  • "You are the ugliest thing I have ever seen."
  • "Your lack of goop is concerning and disgusting."
  • "Away with you."

Leaving his shop:

  • "Farewell!"

Shooting him:

  • "You son of a goop!"
  • "Goophole!"
  • "Goophead!"