Professor MacKrill is one of the secondary characters in the Danish animated movie, Help! I'm a Fish. A scientist, who has an interest in working on potions that would transform a human into a marine creature and vice versa. He appears in the events of Heroes vs. Villains War, along with fellow scientists Captain Neweyes and Ludwig von Drake, providing good measures for some of the characters' changes, including Tiana, Naveen, and Ariel, (the latter to whom he managed to revert her status as a mermaid). He also appears on the side of good, providing moral support for the heroes against the villain forces.