In "Call Of Duty: Zombies", which map introduced the perk "PhD Flopper"?

The map Ascension introduced the perk PHD Flopper in Call of Duty Zombies. PHD Flopper allowed players to dive and create a powerful explosion upon impact, effectively clearing out a group of nearby zombies. This perk became extremely useful in later rounds, providing an advantage to players by protecting them and aiding in their survival against the undead onslaught.