PhD Flopper
PHDF Machine
Games Appeared In Call of Duty: Black Ops
Call of Duty: Black Ops Zombies
Call of Duty: Black Ops II
Maps Appeared In Ascension
Call of the Dead
Die Rise (cameo)
Mob of the Dead (cameo)
Cell Block
Price 2000 points
PhD Flopper is a Perk-a-Cola Machine that appears in the Call of Duty: Black Ops Nazi Zombies maps Ascension, Call of the Dead, Shangri-LaMoon, and secretly on Die Rise and Mob of the Dead, as well as in Cell Block and Origins from the WunderFizz Machine. After the player buys the perk, all damage that the player could cause to themselves by explosives and fall damage is nullified. It completely removes splash damage, making the Ray Gun, Mustang & Sally, Matryoshka Dolls or any explosive good for getting out of tight situations, and adds a miniature explosion whenever a player with the perk dives to prone. However, the explosion only occurs if you dive high enough that you would normally recieve fall damage. It instantly kills all zombies within the small radius of the explosion in the earlier rounds and makes crawlers in the later rounds. Any kill you get from the explosion is only 50 points like all the other explosives.

A Persistent Upgrade on Buried is based off of PhD Flopper, excluding the negating effects of fall damage and overcooked grenades.

Due to the Sliding move replacing the "Dolphin Dive" move in Black Ops III, substitute Gobblegums serve as replacements, which are Danger Closest, Banana Colada, and Slaughter Slide.


(PhD) Night-time scene. (PhD) The streets are mean. (PhD) The things I have seen. (PhD), the good, the bad, and the in-between. When you dive to prone, you are surely gonna own, PhD (Flopper)! When you dive to prone, it's gonna shake ya to the bone, all the zombies gonna groan, 'cause of PhD! (PHD) The feelin's growing strong. (PhD) So right that it feels wrong. (PhD) Like the chorus of a song. (PhD) Not short but not too long. Slap your body to the floor, everybody needs some more, of your lovin', your explosive lovin'. When you dive to prone, it's gonna shake ya to the bone, all the zombies gonna groan, cause of PhD! (PhD) (Flopper)! Damn straight. 


  • Ascension - Near the Lunar Lander "D" (where Frag Grenades are) and close to one of the zombie barriers.
  • Call of the Dead - Inside the lighthouse, above the room where the original characters are trapped behind a vault door.
  • Die Rise - Can be seen on one of the floors when falling down/going up the Spawn Room Elevator. It is an unobtainable perk.



  • It is not actually a vending machine. Instead, it fills a cup placed under the nozzle.
    Phd flopper

    The logo for PhD Flopper

  • According to the players, PhD Flopper taste like Prunes and Chemicals.
  • Takeo is allergic to prunes, making this his least favorite perk
  • In the Die Rise map on Black Ops 2, PhD Flopper is secretly located on the 3rd level when going down the broken cargo elevator (at the beginning). It is physicaly impossible for the player to get to it because there is an invisible barrier around it. It is easier to see this perk machine when going into theater mode going on free camera.
  • PhD Flopper makes it return into Black Ops 2 Zombies, in the map Mob of the Dead. As well as appearing by the docks, it is available for purchase in Cell Block, Grief for 2000 points.
  • It is a play on the soda Dr. Pepper.
  • The jingle is not heard at all in Black Ops II, as the machine is only present on Cell Block, where all the Perk Machines have distorted jingles.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.