- 1 Appearance
- 2 Personality
- 3 History
- 3.1 Captain Underpants and the Big Bad Battle of the Bionic Booger Boy - Part 1: The Night of the Nasty Nostril Nuggets
- 3.2 Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy - Part 2: The Revenge of the Ridiculous Robo-Boogers
- 3.3 The Shocking Showdown of the Staggering Sugamechanger
- 3.4 The Heartbreaking Havoc of the Haunting Hack-A-Ween
In the books, he is a almost-bald man with grey-ish blonde hair. He wears glasses, a red bowtie, and a blue shirt.
In The Epic Tales of Captain Underpants, his hair is orange, and he wears a yellow shirt and dark blue pants, making him look more like his son.
As mentioned before, he is a scientist who spends most of his time conducting experiments. He is very dedicated to his work. He barely pays his son any attention, as shown when he paid no mind to his promise of revenge on George and Harold.
Despite that, he truly loves his son, as he was happy to see he was alright after he was chased by the bionic robot boogers.
Captain Underpants and the Big Bad Battle of the Bionic Booger Boy - Part 1: The Night of the Nasty Nostril Nuggets
When Melvin turns into The Bionic Booger Boy, he gets defeated by Sulu. Mr. Sneedly takes George's advice by switching the batteries in the Combine-O-Tron 2000 so that Melvin can return to normal. It takes two blasts from the Combine-O-Tron 2000 to separate things. Also, before Melvin transforms himself with Combine-O-Trom 2000, it shows him and his wife doing a secret experiment for the government, which apparently included Pop Rocks.
Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy - Part 2: The Revenge of the Ridiculous Robo-Boogers
Everyone, including Cindy and Gaylord, prepares to go home. But it becomes obvious that there was a mistake with the Combine-o-Tron 2000, and now Melvin and Mr. Krupp have switched bodies. Several jokes are made with this outline, including Kruppy the Kid (Mr. Krupp in Melvin's body) demanding Ms. Anthrope give him coffee or he would fire her. Seeing only a fourth grader, Ms. Anthrope gives him a wedgie. As for Mr. Melvin (Melvin in Mr. Krupp's body), he is also the basis of some abuse. For instance, when he runs to hug his mother, who only sees a guy in his underwear coming to give her a hug, she promptly and ruthlessly assaults him with her purse.
George and Harold go back in time two days and retrieve the Combine-o-Tron after it gets Melvin and Mr. Krupp back to normal, but before it is smashed (they replace it with a look-alike). This is done thanks to the use of the Forgetchamacallit 2000 on Melvin's parents
Gaylord, along with Cindy, is one of the parents that go to Lake Summer Camp for Parents' Weekend.
In a flashback, Gaylord and Cindy send Gooch to Melvin's house for a playdate. Melvin, uninterested, steals the five dollar bill Gooch was holding and leaves.