Heritage Lists Rare Jurassic Park Ultimasaurus Prototype
A canceled 1998 Hasbro toy prototype from the Jurassic Park: Chaos Effect line is up for auction through November 22, 2026.
Updated on Nov. 4, 2026 in Collecting
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Heritage Auctions is offering a prototype of the Ultimasaurus, a Jurassic Park toy designed for the canceled Night Hunter wave of the Chaos Effect line. The auction is part of Heritage's Preproduction and Prototypes Toy Auction and closes November 22, 2026.
Why it matters
The Night Hunter line was shut down just before mass production, leaving prototypes like this one as rare survivors of an unreleased product. Collectors have few chances to acquire pieces from canceled toy lines of this kind.
The Ultimasaurus combines parts of four dinosaur species: Tyrannosaurus rex, Triceratops, Ankylosaurus, and Stegosaurus. The auction ends November 22, 2026, and the final sale price has not yet been determined.
The players
Heritage Auctions
Heritage Auctions is a Dallas-based auction house that sells collectibles, including preproduction toys and prototypes.
Hasbro
Hasbro is a major American toy company that produced the Jurassic Park: Chaos Effect line and canceled the Night Hunter wave.
Brian Wilk
Brian Wilk is a former vice president of product development at Hasbro who kept the prototypes from his personal collection.
The details
The Ultimasaurus was designed as part of the Night Hunter wave of the Chaos Effect follow-up line, which cross-engineered dinosaurs into new predators. It was to ship with a Roland Tembo figure, a hatchling version of the dinosaur, and a Gatling missile launcher before the line was canceled at the Final Engineering Pilot stage.
Timeline
1997: Jurassic Park: The Lost World arrives, and the Chaos Effect follow-up line is planned afterward.
November 22, 2026: The Heritage Auctions Preproduction and Prototypes auction closes.
Culture Shift
The Ultimasaurus prototype is a tangible artifact of Hasbro's Jurassic Park: Chaos Effect follow-up line, which was shelved before reaching shelves. Its sale reflects a growing collector market for preproduction toys from canceled 1990s franchise lines.
Collectors can bid on the Ultimasaurus through Heritage Auctions until November 22, 2026, making it one of the few ways to own a piece of the canceled Night Hunter wave. Most fans will not have another chance to buy a preproduction figure from this line.
The takeaway
Preproduction prototypes can offer a rare window into toys that never reached store shelves, and their value often grows as the original product fades from memory. Collectors interested in canceled lines should watch specialty auction houses closely.
What happens next
The Heritage Auctions Preproduction and Prototypes auction closes on November 22, 2026.
Further reading
Explore more about Collecting to see how prototypes like this one are valued by hobbyists.
Source note: This article includes information reported by Comicbook.
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