It is April 11 - Stan's bath day. Despite Pat's insistence, he decides not to cooperate for a wash and scrub because he hates it.
Pat plays an engrossing video game in the living room - but must avoid becoming a telly addict.
Stan is happy as he is going to be on the front page of the next day's paper along with Professor Chi Chi and his new invention.
Pat is excited about going camping, but Stan is less than enthusiastic.
The yellow dog decides to dig a pool in the back garden.
Stan listens to music full blast, much to the annoyance of Pat, who is worried about keeping things quiet for Helmut, his virtual pet.
The professor is sleeping soundly but a shadow breaks suddenly into his lab.
Pat and Stan decide to go to the seaside for the weekend with Stephanie, but at the last minute Stan realises he has forgotten Norbert, his stuffed animal.
Momo gets the measles, so Pat and Stan babysit him along with the rest of Lili's litter.
The lawn needs to be mowed, the trash emptied, window frames painted, and the garage cleaned. Stan is up for it but Pat prefers to be lazy and play video games.
One morning Stan notices that he has got a pimple on his nose.
The pair rehearse a play written by Stephanie.
The duo are asked to babysit Lili's kids, but they lose the bunnies.
The friends manage to turn every event into the craziest of adventures - but jeopardise the football match.
While her house is being renovated Aunt Martha is staying with her nephews. Between the morning aerobics, grocery shopping, gardening and cleaning sessions, her stay is turning into a bit of a nightmare for Pat and Stan. Professor Chichi offers his help to Stan as it's the perfect opportunity for the Professor to test his latest invention: the Psycho-switch! This revolutionary device can influence peoples' behaviour and change their personality. Stan thinks this can potentially turn Aunt Martha into a "cool" aunt but the invention backfires and it's Stan who becomes the guinea pig of this new invention!
The purple hippo and his friend Stan the yellow dog manage to turn every event into the craziest of adventures. Pat's latest book gives him confidence.
Pat fakes being sick in order to escape having to go to Aunt Martha's with Stan. The problem is that Pat really becomes sick and the symptoms are not pretty: Pat's tail starts to grow to worrying proportions...
Stan is sleeping as Pat barges in announcing that Lili just called. She will be there shortly to give him his flea shot. Not a great day for Stan...but that's the least of his worries. This very day keeps on repeating itself everytime he wakes up! Stan is going to have to learn to adapt!
Stephanie is hiding something, and may be in love.
Stan the dog has a meeting with Professor Chi Chi.
Stephanie and Pat offer Stan the dog a hamster to help calm him down.
Aunt Martha comes across a strange map in an antique store which may lead to secret lost treasures.
A meteorite falls into the garden of Pat and Stan and makes a big seemingly bottomless hole. As our heroes are debating in the garden about how deep the hole is, a loud sound startles them and causes them to jump in the hole.
The hippopotamus misplaces a key needed to help launch Professor Chichi's rocket.
Pat plays at being an extra terrestrial, which annoys Stan.
The pair decide to surprise Stephanie on her birthday.
Professor Chi Chi arrives at Pat and Stan's in a panic and asks them if he can stay the night. He was fine-tuning an invention when BANG, his house and his laboratory exploded. Stan offers up his bed while he sleeps on the sofa in the living room. It's like sleeping on a bed of nails! To top it off professor Chi Chi is a sleepwalker... It's going to be a long, hard night!
Stuart returns from his vacation. It's a bit of a surprise when he notices all his friends seem to be avoiding him. Down heartened, Stuart takes refuge with Pat and Stan who although hesitant at first, take him in. The truth is that all his friends are secretly preparing a surprise party for his return!
With the help of Stuart, Pat and Stan invite Aunt Martha over for dinner. They want to ask for the keys to her house by the sea for the weekend. Operation: nephew charm!
Pat makes friends with a spider he finds in the attic. He decides to adopt it and names it Roro... to the great displeasure of Stan who refuses to live with an insect. Especially now the two friends are hosting a dinner the next day for friends. Chance has it that 'Roro' escapes from his jar that evening... causing panic amongst the guests!
The mailman delivers a small package to Pat but Stan grabs it and runs away to open it himself! The package contains a perfume spray which the advertising boasts is 100% guaranteed, making everyone fall in love with whoever wears it. Stephanie won't be able to resist him... But the result is disastrous as everyone steers clear of Stan because of his horrendous smell!
After the remote control overheats, Pat and Stan find themselves alone in the world.
Before leaving for vacation, Stan installs a high-tech alarm system to ward off thieves. The system is connected to an extremely intelligent super computer. While they're getting ready to take the car out of the garage Pat makes a blunder and all the alarm systems are engaged. Result: the house, piloted by the super computer, locks down all the doors and shutters. Pat and Stan find themselves imprisoned in their own house ...
Pat the hippopotamus and Stan the dog hunt for Easter eggs.
Pat has just discovered a picture of his Mammy Madeleine in the attic. He proudly shows it to Stan and Stéphanie. He would really like to hang it in the living room but Stan adamantly refuses which leads to a battle between the two friends and the picture finishes up in pitiful state. Annoyed, Pat goes to see professor Chi Chi to feed his hamster and discovers a strange invisibility paint. With this he can avenge himself against Stan by being the ghost of Mammy Madeleine.
Pat must win the singing competition at the neighbour's party. To gather strength, Pat swallows a whole sandwich and he's overcome by hiccups! Will he be able to get rid of the hiccups and participate in the competition?
The duo install a special antenna - but a great deal of damage is caused when it is struck by lightning.