|Voiced by||Alan Oppenheimer|
Merlin appeared several times in series. His apprentice, Fuddy, is friends with the Ghostbusters and occasionally tries to help them magically, but without much success.
He was portrayed as the highly powerful wizard spoken of in legend.
In the previous series The Ghost Busters, Merlin the Magician is a ghost that knows nothing of any future ghostbusters suggesting that indeed there are two Merlins in Filmations Ghostbusters Franchise.
On the other hand, the topic of the future Ghostbusters never actually came up in the classic episodes, and Merlin never outright stated there weren't future Ghostbusters. So another possibility is that both versions are the same Merlin, who had a change of attitude over the centuries since his death, and simply kept his mouth shut about the future so as not to jeopardize the junior Kong and Spencer.
- The character's voice actor Alan Oppenheimer would voice another Merlin in The Legend of Prince Valiant series.