Humungous Quintin is the fourth pilot episode of T.U.F.F. Puppies. It belongs to All Right! Cartoons. In this 8-minute episode, Quintin creates a device called the grow-izer that can make anyone grow to a height of 100 feet.
Seth and Kitty are racing each other to see who will get the last donut first. Seth drops his Pepsi and Kitty slips and falls. She then gets back up and throws two spikes at Seth's tires on the Seth Mobile. The tires pop and the Seth mobile runs very slowly. Both of them are almost at T.U.F.F. and Seth gets 2 spare tires for the two popped tires quickly. He then rides along T.U.F.F. road, the street that leads to T.U.F.F. HQ, over the speed limit. Cops chase him and pull him over, leaving more time for Kitty. The thing was, the car that pulled over was just a hologram and the person in the car was an inflatable Seth that somehow survived in the car. He was already inside HQ and got the last donut before Kitty. Suddenly, a message from Quintin appears on the T.U.F.F. screen. Quintin says he's going to use his grow-izer to make himself 100-feet tall and be able to step on every single building in Petropolis.
Seth gasped as he finished the donut. Connor just gets in the Connor mobile and Seth hops in it along with him. Dudley just take his bicycle because the rest of the seats were full of fruits Connor had to deliever to Old Lady Anita at the end of the day. Meanwhile, Quintin uses his growth-izer and grows to a height of 100 feet. He destroys the top of Matheni Evil Inc. because of his height. Then the whole building collapses because of his weight. He marches down Back to Phil's Lane and destroys Phil's house, which was uninhabited at the time. Connor, Seth, and Dudley arrive there on time and destroy the growth-izer. Quintin just gets another 100-feet taller and destroys the neighborhood with his giant feet. Then he marches toward Petropolis Skyline which was busy since it was Friday night. Seth got information from Keswick and said the only way to stop Quintin from growing was to shrink the device. Luckily, Connor brought his Shrink-Inator which he stole from Dr. Doofenshmirtz and shrunk the device. Along with it, Quintin shrunk and said "Curse you, Seth, Connor, and Dudley!" which was ironic since one of Dr. Doofensmirtz's devices hit his device.
Seth, Connor, and Dudley return to T.U.F.F. HQ and see a huge box full of donuts and Seth eats all of them before anyone else could. That same night, Dr. Doofenshmirtz was watching the whole thing on Channel 5 News and Wolf Spitzer said that a giant monster terrorized parts of Petroplis and Dr. D said that he will sue Quintin if he has to.