After Angelica finds out that Santa Claus is a fake, she decides to take Phil and Lil's presents away. Meanwhile Tommy tries to convince Chuckie that Santa Claus isn't a scary man. The adults take them all for a trip in the mountains for Christmas and that's where the Christmas spirit strikes Angelica and she decides to give Phil and Lil their presents back so she won't get coal for Christmas. Chaz decides to dress up as Santa and when Chuckie sees him he loses his fear of Santa Claus.

Rugrats mistake fog for clouds.

The babies think a monster lives in Grandpa's mattress.

Angelica orders take out food.

The Pickles prepare for a Christmas card photo.

Chuckie falls for a girl at the park.

The whole family is at the retirement home, visiting Grandpa and Lulu. While Grandpa shows the adults around, Lulu babysits the Rugrats; but once she's distracted, the Rugrats wreak havoc all over the place.

The babies must solve the mystery of Chuckie's missing plush bear during an overnight train ride in celebration of Boris and Minka's wedding anniversary.

Charlotte and Drew go on a power rafting trip. Angelica has to stay with Uncle Stu and Aunt Didi. She gets mad for not giving her attiention, so she fakes breaking a leg. It drives Stu and Didi nuts, but she eventually gets caught and in the end she gets it back double as Charlotte breaks her leg.

Spike adopts a litter of kittens.

Didi needs to go to the bank to run her errands. In the meantime Tommy and Chuckie raid the bank looking for M's. Instead, they cause havoc and help the police catch two notorious criminals.

Playing doctor (not THAT kind of playing doctor) with her ""Binks McGill"" doctor kit (based on the TV show), Angelica diagnoses Chuckie with the entirely ficticious ""Rhinoceritis"", in which Chuckie will turn into a rhino. The signs of ""Rhinoceritis"" includes a bump on a head (where ""a horn is growing in""), scaly skin (actually, scabs), and ornery behavior. Meanwhile, Drew helps Stu and Didi with their income tax, with some sound advice for those who don't file properly.

The Pickles throw a garage sale and Angelica tricks the babies by letting them help out and give out some stuff too. In the end when Didi and Stu come back inside, the entire house is empty and the money they earnt has to be used to replace everything.

When Stu creates a blackout, every light all over town goes out. Chuckie says that now it's dark, every scary monster will come out, but Tommy says that he knows where there's extra light: the refrigerator. The Rugrats have an adventure and by the time they get to the refrigerator, the power comes back on.

The babies, Angelica, and Grandpa have a campout outside. Grandpa tells the legend of the Satchmo, which leads to Chuckie using the restroom, and Tommy figuring out where Chuckie is. Angelica Scares them, Stu is scared to let them sleep outside because of a campout when he was 34. He calms himself down and sleeps with the kids.

Stu and Didi ended up taking Tommy to an important dinner at "Chez Ennui" with Mr. Mucklehoney (president of Mucklehoney Industries, a toy company), since Tiffany the babysitter (via telephone) and Grandpa have different plans (the babysitter's OTHER goldfish died and Grandpa was going bowling with a friend of his named Louise). Tommy, however, has plans of his own, and proceeds to get loose in the resturant kitchen, causing absolute chaos.

Phil and Lil tell Tommy and Chuckie that there's a world behind the mirror, so Tommy and Chuckie explore it. The world is the complete opposite of their world, but when it gets too scary they decide to come back.

After 40 years, Grandpa's long-lost love Morgana pays a visit. Morgana broke up with Grandpa over his affair with another woman named Trixie McGee, but never knew the real story. Also, Grandpa doesn't want her to know that he's a grandfather, so he rushes Tommy and Chuckie to bed. In any case, everyone has to contend with Stu's new remote-controlled couch, which is more like a mechanical bull for two.

After ruining dinner, making Tommy cry and Spike growl, Grandpa gets out of everyone's way by moving to Flushing Waters Retirement Home, which is luxury, (so it says in the commercial), which turns out to be your run-in-the-mill retirement home.

It's Angelica's birthday and she's excited, until Grandpa Lou tells her what it's like to be old. So, she decides to become a baby again, but soon finds it's not as great as she thinks.

Being mistaken for the son of the millionaire Ronald Thump, Tommy is kidnapped by some thugs named Bob and Mike. But the kidnappers soon find out that it was more trouble than it was worth when Tommy begins flushing their stolen loot down the toilet.

After hearing Grandpa's mythical story about a moose, the Rugrats go look for one.

Aunt Miriam and Lou were not nice to each other. They always did and acted like Angelica and Tommy are today. Tommy and Chuckie go in the bathroom and find a hair dryer, a radio and a wig. They think Aunt Mirian is an alien and investigate.

Angelica asks, ""Where do babies come from?"" Her parents originally planned to give her a well-thought-out answer, but ended up answering ""the stork"". After Angelica tells the Rugrats about this, Tommy finds his new ""brother"", ""Milton"", in the nest, as an unhatched egg. Angelica, however, wants it (""Miltonia"", her new ""sister""), to herself.

When a glass was broken in Chaz's greenhouse while the Rugrats go on an adventure, Chuckie does not want to go on any adventures with his friends anymore, but Chuckie's decision also affects Chuckie and Tommy's friendship.