Includes cargo car with dissolvable cargo When submerged in water, cargo dissolves to reveal surprise Surprise prizes include one of the following: unicorn, dragon, puppy, kitten, monkey, alien, elephant, zebra, giraffe, bunny, panda, bulldog Compatible with Thomas & Friends MINIS (sold separately and subject to availability) This MINIS cargo car puts the "prize" in "surprise!" Just take the cargo, submerge it in warm water, and watch it fizzle! When it's done dissolving, it reveals a prize inside: a unicorn, Chinese dragon, puppy, kitten, monkey, alien, elephant, zebra, giraffe, bunny, panda or French bulldog! Place the prize in the cargo car, then attach the cargo car to the included MINIS engine for additional fun!