Scientific Parasites are creatures in Adventure Time's Land of Ooo, who feed on clever brain waves. That's why they are usually found in the pockets of doctors and scientists. They come in many forms and colours and sometimes look like tiny animals.

When Finn is acting like a doctor, he has two science parasites inside his coat pocket. So either Finn is smarter than he appears to be, or the Scientific Parasites are not able to sense who gives off intelligent brain waves and simply assume that all doctors are smart!

See some of the known characters who have a scientific parasite. Do you know any more? Let us know in the comments!

1. In the pocket of Science Whyzard

2. Seen on Princess Bubblegum in "Slumber Party Panic"

3. In Princess Bubblegum's handbag in "Susan Strong"

4. Finn, in "His Hero", had two parasites in his doctor coat

5. Princess Bubblegum has another one when she's wearing her witch hat

6. A blue horse-like parasite can be seen in Dr. Ice Cream's pocket

7. Simon Petrikov (Ice King) has a Scientific Parasite in his shirt pocket

8. Dr. Dextrose has one in his pocket

9. One can be seen in Doctor Princess' pocket

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