In the ooze is a random unmutated ninja turtle that are in scale with the basic action figures. They differ slightly in size and color and each one has their signature weapon on the back of their shell.
*Mutagen Ooze is the mysterious goo that turned the Green Team from pet turtles into the "heroes in a half shell" that they are today. The Ooze also created their many mutant friends and foes—so handle with care! Comes with one of four (pre-mutated) mini-Turtles to collect. Refill canister contains 2.4 oz. of Ooze. *Source: playmatestoys.com