Mystery Inc. was hired by the museum to investigate a ghost trying to steal the Keeler Ruby . While they were discussing the curse on the ruby, a mummy attacked and stole the ruby. Mystery Inc flees, and crash into Jonny Quest, Hadji , Dr. Benton Quest , Race Bannon , and their dog, Bandit , who were investigating the ruby as well. They all travel back to the ruby, only to discover it was missing. They split up into groups, trying to find out where the ruby went. Shaggy , Scooby , and Jonny went to get snacks, only to be attacked by the mummy. Jonny grabbed sodas from the others and used them to cuase the mummy to slip and unmask himself, revealing a human. Velma discovers a projector on him, and activates it.
The projector creates a hologram of Quest's nemesis: Doctor Zin . Zin had already escaped with the ruby, and had taken Dr. Quest captive. Steady-headed, Velma and Jonny realises that Benton was blinking in morse code, spelling the word "tracker". Benton had activated a tracking device in his shoe, which led them to Zin's headquarters on la Isla de los Monstruos - the Island of Monsters. They flew there on a jet, but were shot down by an enormous robotic tentacle. They escape by parashute, and safely land on the the island in front of giant lizards. In order to get away, Hadji levitates some rope to stand straight up onto the trees, which the remainder of the group climb.
The group finds an entrance into Zin's headquarters, and confront him. Zin tried to make a monster attack the group, but Velma stops Bannon from blasting it. She unmasked the beast, revealing the bound and gagged figure of Benton Quest, which she figured out because of his designer shoes. Zin tried to take advantage of their surprise to escape, but Shaggy and Scooby run into him and knock him out. They all then run, frantically off the island before it explodes in Quest's signature move to halt their villains.
- Jonny Quest (first full appearance)(final appearance)
- Hadji (first full appearance)(final appearance)
- Dr. Benton Quest (first full appearance)(final appearance)
- Race Bannon (first full appearance)(final appearance)
- Mummy (single appearance)(no lines)(henchman's disguise)
- Dr. Zin's henchman (single appearance)
- Dr. Zin (single appearance)
- Giant lizards (single appearance)(no lines)
- Ginor-mouse (single appearance)(no lines)
- Bandit (final appearance)
- Keeler Ruby
- Vending machines
- Potato chips
- Scooby Snacks boxes
- Soda can
- Hologram projector
- Scarlet Death Ray (mentioned)
- Quest's tracking device (mentioned)
- Race Bannon's sonic blaster
- Supersonic flyer (mentioned)
- Quest jet
|Dr. Zin's henchman as the Mummy||To steal the Keeler Ruby.|
The following credits try to match how they are displayed in the comic as much as possible:
- Writer: Sholly Fisch
- Artist: Dario Brizuela
- Colorist: Franco Riesco
- Letterer: Saida Temofonte
- Cover Artists: Brizuela & Riesco
- Associate Editor: Jessica Chen
- Editor: Kristy Quinn
- The Jonny Quest universe's presence in the animated portion of Scooby-Doo standard continuity would later be implied by the magnetic repulsor field belt from Quest Research Laboratories in the direct-to-video film Scooby-Doo! and KISS: Rock and Roll Mystery.
- The events of this story would later be mentioned in Fly By Night.
- This issue marks the first appearance of the Jonny Quest characters in a comic book since the cancellation of The Real Adventures of Jonny Quest (published by Dark Horse Comics) eighteen years earlier.
- None known.
Inconsistencies/continuity errors and/or goofs/oddities
- The Quest team were previously depicted as fictional characters in the direct-to-video film Scooby-Doo! Mask of the Blue Falcon.
- Zin's henchman wasn't caught, so it's unknown what happened to him. Fly By Night implies that he was caught, though.