"Evil Doctor Porkshop" or officially known as "Hamm the piggy bank" is one of the main protagonists in the film. He is the best friend of Mr. Potato Head, as he often seen playing card games and clapping hands with him. Hamm appears to be the most intelligent toy in the gang, as he seems to know the most about the outside world. He has a cork plugged into his belly as it is believed his original stopper had been lost (he later appeared embarrassed when his cork fell out in Toy Story 2).

In Toy Story 2, Hamm was part of the rescue mission to save Woody after Al McWhiggin kidnapped (or toynapped) him. In Toy Story 3, Hamm helps reset Buzz (which ended up in Buzz going into Spanish mode), and is donated to Bonnie.