What Yu-Gi-Oh booster pack are the morphtronic cards in?

The Morphtronic monsters were originally introduced in the "Cosmo Blazer" booster pack.

This was the first set to feature them, including cards like Morphtronic Skeletron and Morphtronic Centipede.

However, there are also some Morphtronic monsters in later sets like "Chaos Impact" and "The Shining Darkness".