An educational/informative show about mechanical engineering and technology. It was based on a children's technology book called "[[ The Way Things Work]]" by David Macaulay. The show ran from September, 1993 to October, 1994 on PBS. A total of 20 episodes per season.

The premise: A mammoth from the ice age is frozen in a glacier, and thawed out by a scientist and her kid {{sidekick}}. The mammoth, named Phil, can speak perfect English and comes from a surprisingly sophisticated tribe of mammoth scientist/engineers. Each episode, Dr C. and Mike would, in a [[TheTeaser cold open]], encounter a tricky engineering problem with some device, and Phil would tell a story about solving the same problem years ago. Cue titles, then a FlashBack.

The titular Cro was a young human boy (presumably a Cro-Magnon man), whose adopted Neanderthal family was assimilated into the mammoth community. Although the humans were, for the most part, pretty stupid, the mammoths found their opposable thumbs useful.

Each FlashBack would have the mammoths coach Cro and his Neanderthal family through the solving of a problem with some type of simple machine. It differed from the typical BambooTechnology in that all the devices were built on a foundation of good solid science.

The series is produced by Sesame Workshop.
This program provides examples of:
* AllCavemenWereNeanderthals: All of them, except for Cro
* AnimatedSeries
* BeastMan: Bobb, who is the least evolved of the Neanderthals.
* ExpositoryThemeTune
* FantasticRacism: Earle, Mojo and (sometimes) Esmeralda, the older mammoths in the herd. Are shown as Conservative and don't really like or trust the humans
* FlashBack
* FramingDevice: Phil and the scientists.
* DownerBeginning: And how. The opening sequence starts off with the main family of cavemen being saved from reoccurring villain, a purple sabertooth tiger, by Phil the Mammoth. Then the ground underneath Phil's feet collapses and he seemingly dies before the eyes of his friends when he plummets to his [[DisneyDeath "death"]]. This is made all the more depressing with the knowledge that Phil would not be found for thousands of years, so Cro and company never found out that Phil survived and ended their lives never knowing. Then by the time said Mammoth would be reanimated, everything he knew and loved had long since died, though this never is brought up in the actual series. And if that's not not enough for you, the opening theme song is done to the tune of Paul Simon's "Mother and Child Reunion."
* HotScientist: Among the cast is a rather attractive scientist. At the start of one episode she's in a bikini much to a blushing Phil's embarrassment.
** Yes there was. Her name was Dr. Celia (or Dr. C), and she bore a resemblance to Cro, implying she might be his descendant.
* HulkSpeak: most of the neanderthal characters would talk like this. Complete with the [[Film/BlazingSaddles Mongo Pawn In Game Of Life]] moments:
-->'''Ogg''': That not funny! [[LampshadeHanging Not politically correct either!]]
* IntellectualAnimal: Turns out mammoths were all trained science teachers who spoke perfect late 20th century American English. Who knew?
* LastOfHisKind: Phil, although he takes it [[AngstWhatAngst remarkably well.]] Maybe all the reminiscing helps.
* LiteralAssKicking: Cro got a lot of this in "Meal Like A Pig." He was repeatedly gored in the backside by a wild boar [[spoiler: (which turned out to be just a baby)]] and he repeatedly fell off a small cliff and landed on his butt. He got tangled up in a vine and was dragged butt-first over some rocks. [[spoiler: What's more, it's implied that his adventure ended with him getting a huge dose of this trope from an entire pack of (adult) boars!]]
* [[HumanPopsicle Mammoth Popsicle]]: Phil
* NoFourthWall
* OneWePreparedEarlier
* {{Sidekick}}: Mike to Dr. C
* SmugSnake: Earl and his companion.
* StuffBlowingUp: One episode was dedicated to gunpowder.
* TheTeaser: Involving Phil and the scientists having a problem in the present which cues the flashback
* TheSmurfettePrinciple: Nandy to the cavemen.
* TheUnintelligible: Bobb
* WelcomeEpisode
* WholeEpisodeFlashback