Ajax the Gorilla is the main villain in the Donald Duck cartoon "Donald Duck and the Gorilla".
He was first mentioned on the radio when he escaped from the city zoo. Huey, Dewy, and Louie, Donald's nephews decide to disguise themselves as the fake Ajax to pull a prank on their uncle. This scares Donald, and Huey, Dewy, and Louie laughed at this. It wasn't until the real Ajax arrived at Donald's house, and started to terrorize the inside of his house. Donald and his nephews set out to capture Ajax, but Ajax finds them first and chased after Donald and tried to crush him to death between the table. Huey, Dewy, and Louie heard the radio say that Ajax can be subdued by tear gas.
The nephews then tossed the tear gas at Ajax, which went through his nose, making his eyes water, then he started crying. Donald laughed at him, but was also subdued by tear gas, making him cry as well. Ajax was then presumely taken back to the zoo.