Dan first appears in "The Legend of the Gobblewonker," where he is fishing with his three boys at Lake Gravity Falls. When one of the boys asks if he is fishing correctly, Manly Dan snaps the fishing pole and proceeds to catch a fish with his bare hands and beat it up, with his kids and Tyler cheering him on. He is later seen putting a fish in a headlock, when Soos' boat smashes through his, sending Dan and his sons into the water. He then starts swimming away with his sons when fish start falling from the sky, yelling "they seek revenge!"
He is next seen in "Headhunters," as part of the crowd at Stan Pines's wax museum unveiling. He gets angry when he learns that Stan lied about giving free pizza, and punches a pole as he leaves. He is later deemed a suspect for the murder of Wax Stan by Dipper, due to the axe found at the crime scene. Dipper and Mabel go to the bar where he hangs out and Dipper interrogates him while he is arm-wrestling with a robot game named Bicepticus. However, Dipper learns that he is not the culprit. Manly Dan does tell Dipper that the axe is a left-handed one, which helps Dipper narrow the suspects down to all left-handed suspects.
He is seen again in "Dipper vs. Manliness," eating at Greasy's Diner with Wendy. When Dipper fails to win a manliness tester, Dan shoves Dipper away and effortlessly wins it using his pinky finger, winning all the patrons free pancakes. Later, when Dipper is in the forest, Dan is seen running away from the beast coming their way, shouting at Dipper to run.
Dan appears next in "Fight Fighters," where he goes on a camping trip with Wendy and her brothers.
Dan reappears in "Summerween," trick-or-treating with his sons while dressed up as Vikings, and having them ram through a door.
In "Gideon Rises," he attends the grand closing of the Mystery Shack, exclaiming how much he loves Gideon. Later, at the scene of the Gideon-bot's explosion, he turns against Gideon along with the rest of the crowd when he learns that Gideon lied.
In "Mabel's Guide to Color," he and his sons are briefly seen when Mabel asks the residents of Gravity Falls what their favorite color is (their's being flannel).
In "Into the Bunker", Wendy states that she wanted to come on Dipper's mystery expedition because otherwise she would be cleaning up after her dad, who is shown to have difficulty getting through the small house, knocking over several pieces of furniture and even a support beam.
In "The Golf War," he is among the crowd watching Mabel golf.
In "Little Gift Shop of Horrors," he is seen in the segment Hands Off, where he has a stand of wooden carvings of various animals and other objects like trains while he is carving one in the stand. They all have beards, including the train.
In "A Tale of Two Stans," he is seen building Stanford's cabin.
In "The Stanchurian Candidate," he is at the town meeting to discuss the new mayor, and is one of the voters throwing birdseed at the Friday debate.
In "Weirdmageddon 2: Escape From Reality", he was seen cutting a traffic sign into a triangle shape apparently to try to please Bill Cipher, but to no avail as he was turned into stone by one of Bill's Eye-Bats.
Manly Dan is the proud father figure, often showing his children how to do fun activities like fishing, in his own manly way. Besides this, he is also an emotionally unstable lumberjack. He also may have a bad temper, since in "Headhunters" he gets so mad that he punched a post almost all the way down. In spite of this, he still has some sense of caution, preferring to flee from the Manotaurs rather than fight them.
Dan looks, as his name implies, very manly. He is extremely large, strong, and muscular, and has thick black eyebrows, a bright red beard, with his chest hair and arm hair barely concealed. Manly Dan has short, bright red hair similar in color to Wendy's hair. He wears a stereotypical lumberjack outfit and brown work gloves. Also one of his front teeth is missing.
- Intro: "Gravity Falls Main Title Theme"
- 102. "The Legend of the Gobblewonker"
- 103. "Headhunters"
- 106. "Dipper vs. Manliness"
- 108. "Irrational Treasure" (no lines)
- 110. "Fight Fighters" (no lines)
- 112. "Summerween"
- 114. "Bottomless Pit!"
- 120. "Gideon Rises"
- 201. "Scary-oke"
- 202. "Into the Bunker"
- 203. "The Golf War" (no lines)
- 204. "Sock Opera"
- 206. "Little Gift Shop of Horrors" (no lines)
- 210. "Northwest Mansion Mystery"
- 211. "Not What He Seems"
- 212. "A Tale of Two Stans" (flashback, no lines)
- 214. "The Stanchurian Candidate"
- 215. "The Last Mabelcorn" (no lines)
- 218. "Weirdmageddon Part 1"
- 219. "Weirdmageddon 2: Escape From Reality" (no lines)
"The fishes, they seek revenge!"
"In your face!"
"Pancakes for everyone!"
"For glory, my children! CHARGE!"
"These kegs are full of Meat!"
" We punch what we don't understand!"
- He prefers using his right hand, which he refers to as "the manly hand."
- He claims to have had an encounter with the Hide Behind.
- He is a "punching enthusiast."
- Dan was on the jury that sentenced Gideon Gleeful to prison.
- Dan made Wendy compete in lumberjack games when she was younger.
- It is strongly indicated by Alex Hirsch that Manly Dan is a widower.
- He is a fan of Sev'ral Timez.
- He helped build the Mystery Shack.
- He makes his children train for the apocalypse each year instead of celebrating Christmas.
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