Old Man McGucket is first seen in "The Legend of the Gobblewonker," running up to everyone and telling them that he actually saw The Gobblewonker and that it destroyed his boat. However, he is made fun of by the crowd and the police. Later, it is revealed that he built a mechanical version of The Gobblewonker to gain attention because his son, who was embarassed by him, never wants to spend time with him anymore. He also tells the twins that he also made a homicidal pterodactyl when his wife left him and an 80 ton 'shame bot' when his friend Ernie didn't come to his retirement party. He then went back inside his robot to continue work on a death ray.
McGucket appears next in "Headhunters." He was present at the re-opening of the Gravity Falls Wax Museum. He also asks if the wax statues are alive and if he can survive the wax man uprising to which Mabel answers yes. Dipper and Mabel later find him at the junkyard near a dog house. They wave at him to see if he uses his right or left hand most frequently, and he responds to them by waving his right hand, which has a cayman on it.
In "The Time Traveler's Pig," he appears in flashbacks from previous episodes.
In "Little Dipper," he is seen at Gleeful's Auto Sale, wanting to buy a damaged used car. McGucket later wins ten million dollars by being the runner-up winner in a contest (the first place winner was Grunkle Stan, who turned down the offer). He then eats the check.
In "Bottomless Pit!," he appears in Dipper's story, "Voice Over," as he gives Dipper a voice-altering formula when he is embarrassed by his voice cracking. After Dipper comes back, unsatisfied with the voice induced by the formula, McGucket gives him another, though Dipper does not drink this one.
In "Carpet Diem," he is seen chasing Soos (in Waddles' body) in order to eat him. He ends up changing bodies with Candy Chiu and other characters when he follows Soos into the room with the Electron Carpet at the Mystery Shack. When everyone changed back to their normal bodies, McGucket still threatened to eat Soos.
In "Boyz Crazy," McGucket appears at the Gravity Falls Civic Center and Buffet when Mabel, Candy and Grenda practice their "obsessed boy band scream". McGucket is apparently a fan of Sev'ral Timez, as he is later seen cheering at their concert.
Old Man McGucket is the "old town kook" of Gravity Falls. He sports a long white beard with a band-aid, and has shown the ability to use it as a limb. He has a large pink nose with a few warts on it, as well as a cast and six fingers on his right arm. He wears an old brown hat and brown overalls which are covered by his unusually long beard. Around his feet he wears white bandages. He is missing many teeth and has one gold tooth, and is bald. In an unknown upcoming episode, it is shown that when he was younger, his beard was brown and he had brown hair.
McGucket is the local kook, and is, as the title implies, mildly crazy. However, it is shown that he is quite intelligent, as he has created enormous robotic machines. This plays into his insanity, as he uses them for things like getting attention from his son, revenge against an old colleague for not coming to his retirement party, etc. He can seem to be a bit depressed at times. He usually makes up odd words and phrases. (e.g. scrapdoodle, smitherooons, donkey spittle, shim-sham, etc.).
Like the rest of the town, Dipper and Mabel think Old Man McGucket is crazy and are puzzled by his strange behavior; these major turn-offs contribute to the twins' lack of desire to interact with the old man. McGucket typically maintains a friendly attitude toward the kids, despite the fact that they do not return the action. McGucket occasionally gets involved in the kids' adventures, even playing a significant role at times.
Despite Old Man McGucket's love for his son and aspirations to spend time with him, Lake Ranger McGucket tends to avoid his father, for fear of embarrassment. Thus, the father becomes even more starved of attention and will go to ever greater lengths to catch his son's attention, but always unsuccessfully.
- 102. "The Legend of the Gobblewonker"
- 103. "Headhunters"
- 104. "The Hand That Rocks the Mabel"
- 106. "Dipper vs. Manliness"
- 107. "Double Dipper"
- 108. "Irrational Treasure"
- 109. "The Time Traveler's Pig" (flashback)
- 110. "Fight Fighters"
- 111. "Little Dipper"
- 112. "Summerween"
- 114. "Bottomless Pit!"
- 115. "The Deep End"
- 116. "Carpet Diem"
- 117. "Boyz Crazy"
"Aw, donkey spittle! Banjo polish!"
"Well, first I just hootynanied up a bio mechanical brain-wave generator, and then I learned how to operate a stick shift with my beard."
"Old Man McGucket, local kook. Are the wax figures alive? And follow up question: can I survive the wax man uprising?"
"You can run, but I'll still be in your niiightmares!"
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- Old Man McGucket was originally named "Crazy Larry."