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The subject of this article appears in Call of Duty: Black Ops 4 The subject of this article appeared in Zombies mode
For the predecessor, see PhD Flopper.

"Slide to build up a charge. Once fully charged, slide into an enemy to trigger an explosion. Gain full resistance to self-inflicted explosive damage and partial resistance to enemy explosive damage."
— Description

PhD Slider is a Perk featured in Call of Duty: Black Ops 4 Zombies. It is the successor of PhD Flopper, a perk previously featured in Call of Duty: Black Ops and Call of Duty: Black Ops II. It can be unlocked for use at Level 42, or as early as Level 6 with the use of Secret Sauce.

It appears as a Perk Vapor within Voyage of DespairIX, Dead of the Night, and Ancient Evil and as a traditional Perk-a-Cola within Blood of the DeadClassifiedAlpha Omega, and Tag der Toten. 


PhD Slider, when purchased, allows players to create an explosion that can kill zombies, as well as reduce explosive damage the player receives. In order to create an explosion, the player must first "charge" up the perk, which can be achieved by sliding. Once a charge is ready, the perk icon will begin to pulsate and flash. When the perk is initially purchased, the player will already have a full charge ready.

When PhD Slider is set as the "Modifier" perk and the player has all of their other perks, the perk will allow the player to have increased sliding distance, as well as having immunity to trap damage whilst sliding. Players will also gain increased explosive damage on enemies when entering a slide from a greater height.

On January 15th, 2019 with Patch 1.11, PhD Slider was buffed, allowing players to take zero self-inflicted explosive damage. However, the damage reduction for enemy explosive attacks has been reduced from 80% to 50%.


  • The Doctor is In (15 Gamerscore.png/Bronze Trophy Bronze Trophy PS3 icon.png) - Use PhD Slider to fall 10 feet and kill 10 zombies at once.