"Tri-Stone Area" is an episode of Phineas and Ferb.
Note: The parts of the episode with Dan Povenmire and Jeff "Swampy" Marsh are in bold. In 27,000 B.C., Phinabunk and Gerb (caveman versions of Phineas and Ferb) go through their stone-carved blueprints in the backyard and decide to make a wheel.
Jeff "Swampy" Marsh shows Dan Povenmire his storyboards for the caveman episode, and explains that all of the characters will speak in a nearly incomprehensible cave-talk and Doofenshmirtz will just grunt. They both agree that they will explain the premise in a low budget live-action photo animation when needed, so the audience won't get confused. Povenmire then asks Swampy where Perry is.
Bunka (Perry), a platypus-like animal with frilly spiked fur, a big brow, long canines, and red spines on his tail, is briefed by Monobrow, and a monkey named Gnarl. Monobrow explains to Bunka that Doofengung is planning something that Bunka should thwart. After briefing Bunka, Monobrow accidentally slips on one of Gnarl's banana peels.
Da and Mog say goodbye by smelling each other's armpits before Da goes out to hunt. Mog then notices her messy hair in the mirror, and decides to go to Bobbi's to get it done, putting Can-tok in charge by presenting her with a staff as she leaves. Can-tok tells Phinabunk and Gerb that she's in charge before going to communicate with Stacy long distance by using the vibrations of a log. Outside, a pile of rocks are delivered to Phinabunk and Gerb, who tell Isabelock, Boofgard and Baljug to make a wheel out of one of them, though it takes a few tries for them to get it right.
At Doofengung's cave, a neanderthal-esque Doofenshmirtz entertains himself by watching water droplets slowly drip from a stalactite. Bunka crashes through the stone wall and Doofengung traps him in a bone cage. Doofengung explains that Roger, a human who is apparently one step ahead of him on the evolutionary chain, is living luxuriously while Doofengung lives in a dirty cave. Doofengung states that it is unfair, and begins to throw a fit.
Dan decides that the caveman episode was a bad idea, but Swampy, who has become interested, takes over. Swampy explains to Dan that Phinabunk and Gerb had completed their design of the wheel, and present it to their friends. Can-tok notices them playing with their wheels outside, and runs off to inform Mog. Phinabunk realizes that the four wheels can be put together to pull a single vehicle, and the children decide to construct one.
Meanwhile, Doofengung shows Bunka his Stick-inator, explaining that he plans to poke a mammoth with it, causing the mammoth herd to rampage through Roger's territory, scaring him off so Doofengung can go claim it. Dan translates Doofengung's plan for the audience.
As Can-tok walks home, disappointed that Mog would not listen to her, she runs into Phinabunk, Gerb and the others in their new car-like vehicle constructed with rock and wood. She pursues them, but is momentarily distracted by Jerabunk. Phinabunk and Gerb's vehicle rides past Conk, whose foot is frozen to a glacier. As Can-tok chases after Phinabunk and Gerb, she is picked up by a vulture and carried off to an active volcano. Can-tok hits the vulture with her staff, causing it to drop her near the lava, which burns the tip of the staff.
At the same time, Doofengung uses his stick-inator on one of the mammoths, though his plan backfires as the mammoths turn around and chase him. As Doofengung runs past Phinabunk and Gerb, the mammoths stampede over the vehicle, completely crushing it before Mog can see it. Can-tok waves her staff in frustration, and it suddenly sparks fire. As the mammoths crush his cave house, Doofengung curses Bunka, who walks past him, still in his bone cage.
Dan and Swampy soon realize that they forgot to put a song in the episode, and begin to write one while dancing. Phinabunk, Gerb, and all of their friends and family gather around Can-tok's fire and begin to sing a caveman version of Gitchee Gitchee Goo in celebration.
- Vincent Martella as Phinabunk
- Ashley Tisdale as Can-tok
- Thomas Sangster as Gerb
- Caroline Rhea as Mog
- Mitchel Musso as Jerabunk
- Dan Povenmire as Doofengung/Himself
- Jeff "Swampy" Marsh as Monobrow/Himself
- Richard O'Brien as Lawrence Fletcher
- Dee Bradley Baker as Bunka, T-Rex
- Alyson Stoner as Isabelock
- Bobby Gaylor as Boofgard
- Maulik Pancholy as Baljug
- Tyler Alexander Mann as Gnarl
- John DiMaggio as Conk
- Carlos Alazraqui as Bobbi Fabulous
- In some scenes, Gretchen is not wearing her glasses when Roger, Carl, and Bobbi are all seen wearing their glasses.
- Before the song Zubada starts, only Phinabunk, Gerb, Can-tok, Bunka, Isabelock, Boofgard, Baljug, Jerabunk, and Mog and Da were seen but then, the Caveside Girls appear out of nowhere.
- When Phinabunk sings the line "Ooh chaka ooh chaka" in the song, Gerb's nose briefly turns into an outlined square.
- The first time Katie is seen, she does not have sandals on. The second time after, she has sandals.
- When the mammoths trample Doofenshmirtz house, they go from left to right. But in Doofenshmirtz plans, Roger's house was on the left of Doofenshmirtz house. The mammoths would have to trample Roger's house too, which would have made Doofenshmirtz plot a success.
- The episode takes place in 27,000 B.C.
- Dan Povenmire and Swampy Marsh make an appearance in this episode, in stop-motion.
- This is the first episode where, for most of the episode, the characters don't speak English.
- This episode may have explained how Conk ended up frozen in an iceberg in "Boyfriend From 27,000 B.C.". Conk became distracted while the boys rode by, and the wall of ice snuck up on him and trapped his foot.
- When Can-tok runs through the bushes, her hair is briefly changed to the way Candace's hair looks.
- As none of the characters speak English, this episode is probably hard to understand on its own. However, a long-time viewer may pick up on the equivalents of catch phrases like "A platypus? ... Perry the Platypus!", "Behold, my ...inator!", "Aren't you a little young ...", and such. Furthermore, some words are repeated through the episode, and some are rather similar to English words; examples: "ni" is "no", "in charga" is "in charge", etcetera.
- The fourth wall is broken when Dan says Swampy's part of the episode is hard to understand, and Swampy says that's a good reason why they're doing the stop-motion pictures showing themselves in the episode.
- Doofenshmirtz uses the famous illustration, "The Ascent of Man," in his presentation as he had done in "Phineas and Ferb Hawaiian Vacation." Also, as in Hawaii where Perry had a party on the deserted isle while Doofenshmirtz suffered, Roger Doofenshmirtz parties in pre-historic Danville while Doofenshmirtz complains about his living accommodations.
- All human characters walk around barefoot, much like most characters from The Flintstones. The Tri-Stone Area is also a parody of Bedrock.
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