Efforts to solve an environmental crisis put the dinosaurs on the road to doomsday.

Questions about life's meaning plague the population, so the Elders dictate a belief system called "Potatoism."

Earl, Roy and Charlene pose as entertainers and rush to the front to retrieve Robbie.

Earl has the honor of tossing his mother-in-law into the tar pits on "Hurling Day."

Earl is hired as a network executive when his answers on a test for new television shows prove to be surprisingly accurate.

Earl lays an egg when he asks his boss for a raise, and Fran lays an egg--literally.

When Robbie flubs his initiation into the Young Males' Carnivore Association, Earl fears his son may be a herbivore.

The four-legged dinosaurs encroach on the pistachio-nut supply of the "normal" dinosaurs...and that means war.

Family duties and the baby combine to frazzle Fran, and Earl can't figure out her problem.

Earl buys Fran two rare grapdelites for dinner, unaware that they are the last of their species.

Earl drives Ethyl to her reunion, and the kids drive Fran crazy when she tries to get them to pose for a portrait.

Robbie and Charlene go against Earl's orders and sneak out to see his estranged sister, Pearl, a country star, perform. Roy falls in love with Pearl and plans to settle down with her, despite Earl's protests.

Lurking in the Sinclair refrigerator are delectable creatures that go bad, very bad, while Charlene watches the baby.

When the Sinclair baby sprouts a golden horn, he is trumpeted as the prophesied King of the Dinosaurs.

Charlene gets a tail, which whips up strange feelings in Earl, whose little girl is no longer so little.

Fran and Earl face an untimely extinction when the baby enters his "terrible twos."

When Earl is caught by the Parent Police losing his temper at the baby, he loses his parenting license.

When the Sinclairs' TV is wrecked, Earl enters the family on a game show to win a new set.

Robbie questions howling as a rite of passage--an act that puts Earl and Roy at odds with each other.

Earl is in charge of potty training the baby, who escapes to do his business any way he wants.

Another one of the infomercial for a home course in how to become a paleontologist is supplemented by clips from previous episodes. Featuring the past clips from Season 2 to Season 3.

An archaeologist documents dinosaurs' way of life as they may have existed long ago, but clips from previous episodes tell a different story.

Charlene wants to make a fashion statement with an expensive coat, but the coat leads her into a vain attempt to achieve status.

Robbie gets pointers on how to approach girls from a streetwise contemporary named Spike.

When too many overworked employees drop dead from exhaustion, businesses give dinosaurs two weeks off for a vacation; B.P. Richfield advises Earl to bring his family to WeSaySo Land, which is supposed to be a fun amusement park for the family. What the Sinclairs find is an overpriced, cow themed park that is newly under construction, and they have to stay for 14 days.

Robbie crosses over to the swamps and gets sold on the mammals' "swamp music", but they're liable to be sold out in a dinosaur record deal, which Robbie orchestrated.

Earl, Robbie and Roy stumble into a tar pit when they take the Baby into the forest for the traditional dinosaur Wilderness Rite of Passage.

When overwhelming urges to do the mating dance arise in Robbie, Earl prefers not to discuss it, but Fran waltzes into Robbie's classroom to educate the kids about it.

When Robbie can't beat a gang of hoods (who keep beating him), he joins them.

The males, including Earl, Robbie, and the Baby, go into the wilderness to rediscover their ""reptiles within,"" while back home the girls warm their cold blood with the boys' beer.

Robbie objects to the career--tree pusher--assigned to him by the "Job Wizard."

The four-leggers are blamed for the failing economy and legislation is passed to make their presence in Pangea illegal.

Earl anticipates a promotion as he awaits a dinner with Richfield; Robbie brings home a "pet" human.

Wesayso insists Roy replace Earl as the father of the Sinclairs, who are selected as the Wesayso spokesfamily.

Robbie resorts to using Thornoids in an attempt to impress a girl at school.

Charlene feels her family is neglecting her, so she gets their attention by winning the school talent show but her rising fame is riding on the backs of three young cavelings she found in the forest whose mother is looking for them.

A liberated single female's ideas make Fran reconsider renewing her marriage license.

After failing to mow the lawn, Robbie challenges Earl for male domination of the family... and wins.

A wild plant has a weird effect on the dinosaurs--it makes them dopey and happy, to the exclusion of everything else.

Ethel reads the Baby a story called "If You Were a Tree" about a dinosaur tree pusher who gets struck by lightning and swaps souls with the tree he's trying to demolish.