A massive sugar high has Baby bouncing off the walls, which is how he gets a mysterious bump that morphs into a majestic golden horn. It turns out that the horn is the sign of the prophesied leader of the dinosaurs, so Baby becomes the king... which is perfectly fine with Earl.
Fran thinks that the family spends far too much time in front of the TV. So when a freak accident destroys it, she sees it as a blessing-- but Earl is looking for another way out. So he enters the family in a game show in which the prize is a deluxe television set.
Charlene notices that the other females are getting their tails before her. So while Fran tries to teach her that a beautiful body doesn't make a beautiful mind, Charlene thinks of quick fixes and the males in the house tease.
It's Fran and Earl's twentieth anniversary. To make it very special, Earl buys a delicacy for dinner: a species called grapdelites, who, thanks to his fellow snackers, are virtually extinct. While Earl desperately tries to keep everybody's prying paws off of his, Robbie fights to save their species.
To drive up employee morale (or possibly to keep from getting sued), Mr. Richfield decides to create an idiot example of perfection and call him the "Employee of the Month." And who should make the grade but Earl?
Robbie goes to see the Job Wizard who dictates what careers everybody has for the rest of their lives. He hopes to be picked to be a rock legend but his dream falls flat when it's announced he's going to be a tree pusher like his father.
After meeting new neighbor Monica, Fran learns that dinosaurs have to renew their marriage licenses after a certain amount of time... and then realizes that her marriage to Earl is technically invalid. Which is fine, until she realizes Earl doesn't know her at all.
Robbie realizes he has no idea how to talk to girls. Desperate, he asks for help from Spike, a troublemaker who does very well with the ladies. Unfortunately, Spike's advice causes more harm for Robbie than good.
After Fran realizes she switched nests in Lamaze Class with Glenda Molehill, she starts to think that Baby isn't their baby. Her fears don't seem well-founded, though... until she meets the Molehill baby, Aubrey, who looks like Baby with Earl's green skin! After an unbearable baby swap, the two families ask for help from the wise Solomon the Great.
Refrigerator Day is a day to celebrate dinosaurs' crowning achievement: the fridge. However, Earl's plans to give great presents does not sit well with the fact that he's not getting a Fridge Day bonus this year. So when authorities come to take back their presents (and fridge), the entire family loses the holiday spirit.
Monica gets a job pushing down trees for Wesayso but is fired after refusing the advances of new coworker Al "Sexual" Harris, popular for his double entendres. Determined not to let the males in the workforce hold her down, she takes the matter to court but doesn't get much help in her case.
Fran watches a TV show, Just Listening, where the host takes calls from troubled dinosaurs but doesn't offer to help them. When she suggests to the host he advise his callers about their problems, he refuses and Fran becomes the new host of the show, Just Advising, much to Earl's dismay.
Robbie designs a science project that if executed in real life, could naturally power dinosaurs' houses and lower their heating bills. This proves to be bad business for Wesayso and B.P. Richfield is out to ruin Robbie's image and credibility to the public.
An important lesson is learned by all when Robbie brings home a mysterious happy plant which makes everyone feel all groovy-like. As things spiral out of control, Fran finally has to put her foot down.
When Ethel unexpectedly dies, she goes to the afterlife and finds out how beautiful it is. Before she can be reunited with her husband, it's revealed she's only unconscious and will wake up. Anxious to soon return to the afterlife, Ethel goes on TV and tells the viewers how wonderful it is. But the afterlife has its own message for Ethel.
A news bulletin announces a nationwide shortage of pistachio nuts, which is blamed on the four legged dinosaurs. War breaks out between the two-leggers and four-leggers and Robbie and Spike are drafted into the battle. Earl supports the fight at first but questions how truthful the government is being with them after a news reporter mistakenly reveals all is not going as well as planned.
Earl and Roy impersonate USO girls and go with Charlene to the front to find out what's happened to Robbie. Earl returns home without his son and he and Fran are moved to panic and grief when the news reports one of the soldiers was killed in battle.
The Chief Elder dies after naming the Baby, and B.P Richfield runs for new Chief Elder. His picks Earl for his opponent to beat; Earl is fine with running against Richfield and losing, until his conscience convinces him it's in everybody's best interest not to let Richfield become ruler over the public. But is he cut out to win the election?
Charlene thinks having an expensive coat will make it easier for her to fit in with the popular girls. But once she acquires the talking coat, it does help her to become popular, at the price of alienating herself from her friends and turning against her family.
Robbie is fed up with being beaten up by a wild pack. So he enlists the help of his friend, Spike, to help him. Spike introduces Robbie to the other members of his gang, the Scavengers; but Robbie finds himself in more trouble when after a night of drinking with the Scavengers, it seems he's eaten their leader.
Wesayso attempts to present a positive image of its company to the public with the perfect family, 'The Wesayso Family'. However, the company decides that it would be better if Roy becomes the head of the Sinclair household, and Earl moves out.