Production
Mattel originally produced the Hot Wheel Attack Packs in 1992 to 1994. They also became available through McDonald's Happy Meals. They are still available via sites like Amazon and eBay.
Types
The Hot Wheel Attack Packs that transform are available as cars, trucks, spaceships, aircraft and other vehicles. Once you push a button, the car opens up its mouth and transforms into a monster, animal, alien or other creature. The creatures have very large features, such as over-sized tongues, eyes and teeth.
Details
The Attack Pack cars are recommended for ages 4 and up. When looking to purchase the specific toy vehicles that transform into creatures, make sure you find the correct type, as another line of Hot Wheel Attack Packs released in 2000 do not transform.