Dr. Pacenstein is a minor antagonist, supported by his sidekick Eeghost. He is the neighbor of Count Pacula. He is voiced by Erica Mendez.
In Pac's Scary Halloween Part I, he invited Pac, Spiral and Cylindria to his castle for a late-night dinner party. He insisted that anything suspicious about him and his castle were merely part of "the ultimate Halloween experience", as he called it. By the end of the episode, he switches bodies with Pac-Man, planning to abuse his new powers to conquer Pac-World, as revenge against those who ridiculed him.
In Pac's Scary Halloween Part II,
|Pac-Man and the Ghostly Adventures Characters|
|Pac-Man | Cylindria | Spiral | Ghost Gang (Blinky - Inky - Pinky - Clyde) | Betrayus|
|President Spheros | Sir Cumference | Grinder | Fuzbitz | Dr. Buttocks | Butt-ler|
|Skeebo | Spheria | Ms. Globular | Mr. Strictler | Mr. Dome | Braces | Zac | Sunny | Obtuse | Pacinator | Lightning Ghost | Mavis | Specter | Fred | Cyclops Ghost | Ogle | Fire Ghost | Ice Ghost | Tentacle Ghost | Guardian Ghost | Aqua Ghost | Drill-Bit Ghost | Alien Ghost | Ghosteroid | Ghost Shark | Apex |Professor PointyBrains | Tip | Madame Ghoulasha | Count Pacula | Fluffy | Nether-Gargoyle | Nether-Slug | Pac-Dragon | Stalker | Venus Dragon Flytrap | Monobat | Stone Temple Guardian | Jean | Do-ug | Cap'n Banshee | Elli | Dr. Pacenstein | Moondog | Starchild | Grannie | Santa Pac | Grindette | Eeghost|