MYSTERY INCORPORATED! This is only the first rung on the ladder of your demise. And this time, you'll be the ones unmasked... as the buffoons you truly are!
~ Jonathan Jacobo as the Evil Masked Figure.

Dr. Jonathan Jacobo, otherwise known as Heather Jasper Howe or The Evil Masked Figure is the main antagonist of Scooby-Doo 2: Monsters Unleashed. He is a mad scientist who wants revenge on the Mystery Incorporated for capturing and imprisoning him in the past.

As Dr. Jonathan Jacobo, he was portrayed by Tim Blake Nelson who also portrayed The Leader in the Marvel Cinematic Universe. As Heather Jasper Howe, he was portrayed by Alicia Silverstone who also portrayed Adrian Forrester in The Crush. As the Evil Masked Figure, he was voiced by Scott McNeil.



Dr. Jonathan Jacobo.

Jonathan Jacobo is a typical mad scientist, who wants to create real monsters and enjoy the rampages they caused. After being caught by the Mystery Incorporated, Jacobo hold a lifelong grudge and vowed to have his revenge on them at all cost.

As Heather Jasper Howe, she seems to be a benevolent, polite reporter at the first glance, but as the story progesses, she reveals her true nature as a fraudulent, untrustworthy person. It is later revealed that she is just a facade of Jacobo. In addation, the last scene also shows that Jacobo can be angered for simply petty reasons.



Jonathan Jacobo is a scientist who always wanted to create real monsters with a book. To do this, he dressed like a Pterodactyl Ghost to rob those he needs for such experiments. Eventually he was caught by the Mystery Gang on one occasion and sent to prison. Jacobo eventually broke out of jail on a hay glider. However, an accident occured in the process and Jacobo is believed to be dead due to this.

Scooby-Doo 2: Monsters Unleashed

Evil Masked Figure

The Evil Masked Figure.

In truth, Jacobo is still alive, and dressed up like a female reporter named Heather Jasper Howe and an Evil Masked Figure and turned his old Pterodactyl Ghost costume into a real monster with a machine he built, along with costumes of some other past Scooby-Doo monsters to get revenge on Scooby and his friends by destroying them, their reputation and their hometown Coolsville. As Heather, he spreaded informations against the Mystery Gang for their failures.

Jacobo later reappeared as the Evil Masked Figure in the climax, controlled all the monsters to fight and kill the Gang. Luckily after a big battle with the Tar Monster, Scooby managed to turn all the monsters that Jacobo created back into costumes.

After his defeat, the Evil Masked Figure is caught and unmasked in front of the public as Heather Jasper Howe. However, the Mystery Gang suspected something and unmasked her for the second time, revealed that Heather is Jacobo in disguise. Jacobo and the camera man Ned who aids Heather were then sent to jail.


So long, SUCKERS!!! Ah, help me, suckers!
~ Jonathan Jacobo escaping prison, only to fall into his apparent death.
I would have gotten away with it... if it weren't for those meddling punks, and their dumb dog!
~ Jonathan Jacobo after his defeat.



  • In the Scooby-Doo Show, a character named Johnny is instead the Pterodactyl Ghost however all these two characters have in common is the same first name and disguise.


           Scooby-doo logo Villains

Scooby Doo, Where are You!
Norma Deathman | Werner Wolf

The 13 Ghosts of Scooby-Doo
Maldor the Malevolent | Werewolves

Movies Series 1
Revolta | Grim Creeper | Colonel Calloway | Dracula

Movies Series 2
Simone Lenoir | Lena Dupree | Jacques | Snakebite Scruggs | Morgan Moonscar | Ben Ravencroft | Sarah Ravencroft | Enormous Turkey | Max | Phantom Virus | T-Rex | Bill McLemore

Movies Series 3
Mr. Smiley | El Chupacabra | Amelia von Butch | Ghost of Cleopatra | Biff Wellington | Mr. Mysterio | Professor Jeffries | Krudsky | Goblin King | Miss Mirimoto | Black Samurai

Movies Series 4
Ranger Knudsen | Babyface Boretti | Ricky LaRue | Shannon Lucas | Stephanie McMahon | Rafe & Kyle | Ye Phantom Parrot

What's New Scooby-Doo?
30 Foot Shaggy | Susie Smythe | Mademoiselle Chantal | Menacing Metallic Clown | Phylidia Flanders

Scooby-Doo Mystery Incorporated
Professor Pericles | Mr. E | Brad Chiles | Judy Reeves | Mayor Fred Jones, Sr. | Evil Entity | Marcie Fleach | Ed Machine | Baylor Hotner | Alice May | Danny Darrow | Slime Mutant | Gator People | Ghost Truck | Man-Crab | Que Horrifico | Phantom | Gnome

Be Cool, Scooby-Doo!
Butler 3000 | Stealin' Stan

Live Action
Scrappy-Doo | N' Goo Tuana | Zarkos | Demons | Luna Ghost | Jonathan Jacobo | Principal Deedle | Ezekial Gallows | Prudence Prufrock | Wanda Grubwort | Lake Monster | Carol

Black Knight Ghost | Creeper | Redbread | Ghost Clown | Phantom of Vasquez Castle | Snow Ghost | Phantom Shadow | Space Kook | Tar Monster | Old Iron Face | Ghost of Captain Cutler | Skeleton Men | 10,000 Volt Ghost | Pterodactyl Ghost | Bald Zombie | Miner 49er | Elias Kingston | Apeman | Charlie the Funland Robot | Beast of Bottomless Lake | Caveman | Octopus Monster | Phony Phantom | Witch Doctor | Lady Vampire of the Bay | Ghost of Christmas Never

Video Games
Ghoul King | Mastermind | Mindi Stiles | Robert Zabrinski | Selena Drake | Walter Peabody | Ghost Hunter Haunter

Community content is available under CC-BY-SA unless otherwise noted.