Roland Tembo with Ultimasaurus

The Chaos Effect line, released in 1998, was an exciting and experimental extension of the Jurassic Park franchise, blending DNA from different dinosaurs and modern animals to create hybrid creatures. This line was meant to be tied into a planned animated series, which ultimately never aired, but the toys brought to life these bizarre and dangerous hybrid creations. Each figure in the line featured colorful, exaggerated designs and often came with special action features or capture gear.

The Ian Malcolm figure from this line came with a T-Rex hatchling, maintaining a connection to the human element of the Jurassic Park universe, while Roland Tembo was packaged with an unreleased Ultimasaurus hatchling, a hybrid creature that was never fully produced.