When the farmer puts a sign that says "Welcome Buyers", the animals fear that he is selling the barn to other people, so whenever someone comes to the barn, they use tactics to scare them away. Then, though, they realize the Farmer's surname is Buyer and he is only having a family reunion. So they returned the Farmer's family to the barnyard just in time for the reunion.

The animals turn the barnyard into a Wild West theme park to raise the Farmer's bail money (who got arrested because of Otis wearing a viking helmet and mooning a cop) and decide to hire an actor to play the bandit. Instead of an actor, unfortunately, a real bandit shows up to pillage the town. So Pig comes to Otis' rescue with unicorns from the unicorn theme park to stop the bandit from attacking the barnyard.

The animals feel bad for the Farmer after seeing that everyone forgot his birthday, so they decide to throw him a party and tell him it's a dream, but the Farmer gets carried away. He does this by stealing a motorcycle from a gang of bikers and then believes that the motorcycle can fly so he takes the veterinarian with him. But he forgot that it doesn't and he and the veterinarian ends up falling to the ground below. So Otis hurries to save them before they fall to their death.

The animals get arrested when they are mistakened by the police for bandits disguised in animal costumes. Chained together, they try to escape so that they can use a computer to find the real thieves. But when they do catch the real thieves, the police says due to budget cuts, they aren't any keys to free them from their chain, so now they're stuck chained together

After Otis accidentally breaks up Peck's body with a hammer, he rebuilds Peck by adding robot parts to him so he can be a big help around the barnyard, but things go awry when Peck's circuits get overloaded after Otis puts pizza inside him and he goes out of control.

Otis and the gang go to an arcade so they can get tickets to buy a gaming console. Snotty Boy and his friends also want the console, however, so they have to compete to see who can get the most tickets first. When the animals get the game console, they end up giving it to a little boy who begs for the console and turns out to be a midget. The arcade is eventually destroyed when Pig accidentally shines his pocket mirror in a animatronic fox's eyes which had a 3rd setting called "Destroy Humans."

The animals successfully prank Mrs. Beady into taking a holiday. Now, they no longer have to worry about getting caught by her, but now Otis experiences withdrawal symptoms because he is no longer able to prank her.

When a beautiful she-donkey named Prunella takes an interest in Pip, Bessy suspects ulterior motives and follows them on their dates, causing the other animals to accuse her of being jealous.

The leprechaun steals the farmer's potatoes after Otis sprayed the potatoes, Otis and pals must stop him before the farmer goes bankrupt and the animals for less outlet. Unfortunately, also, the leprechaun turns Freddy and Peck into shamrocks and Pig into a corn beef sandwich head. Luckily, Otis gets an idea to cut out the middle man meaning to find the leprechaun's gold instead of catching him to surrender.

Otis finds a giant chicken egg and decides to hatch it so they can have a fifth for polo. The giant chicken egg turns out to be that of a dinosaur, which proceeds to wreak havoc wherever it goes. The animals want to get rid of it, but Otis has paternal feelings and begs the animals to give him a chance. They relent, but things truly go awry when the dinosaur quickly grows a thousand times its size and falls in love with Mrs. Beady.

Pig's mole subjects (from when he was Emperor of the Mole People for 45 minutes) have sought him out to return as their Emperor and defend them from Eric the Terrible, a verbally abusive worm and with the mole people around the barnyard, they can't get Pig to hang out with them because they keep shocking them when they are near Pig.