When younger brother Ferguson displays her training bra in show and tell, Clarissa hatches a plan to send Ferg-face into outer space via helium balloons and a straight jacket.

After Sam's mom Debbie arrives in town, she announces that she's going to take Sam back to Seattle with her. Clarissa and Sam remember all the great times they've had before they have to say goodbye.

After vowing to never babysit Elsie Soaperstein again, Clarissa lets herself get guilted into sitting for her on the Soaperstein's anniversay. Elsie's a big time troble maker with only one weakness- Ferguson.

It's a sad day as Clarissa complete her last assignment for the Dispatch - an article dedicated to the future.. where will everyone be in 20 years?

Clarissa gets a major crush on local weatherman Flip Fontana. But she's in for a big disappointment when she finally meets him.

Clarissa has her work cut out for her, when Piper, the daughter of one of her mom's old school friends comes to stay and is far from friendly.

Clarissa discovers that real science can be really weird. After interviewing a woman who supposedly spotted a UFO, Clarissa decides to get to the bottom of the UFO phenomena herself.

Clarissa finds a topic for her school project- TV. She has to watch for 24 hours in order to make observations for her report. However, a plot created by Ferguson makes her think she's lost her mind from watching so much television.

Clarissa becomes worried about her parents' marriage when a debate starts between the two of them. Marshall wants to follow his dream of building a brand new mall, while Janet is more concerned about saving the trees on the same piece of property.

Clarissa is given her own advice column in the school paper. She soon finds out that giving people good advice isn't as easy as she thought.

While staying with the Darlings for a weekend, Sam seems to be spending all of his time with Mr. and Mrs. Darling, making Clarissa jealous. Both Ferguson and Clarissa plan how to get rid of Sam.

After one bad date too many, Sam realizes that the perfect girl for him is Clarissa. They agree to go out on a date, but it turns into a disaster and they both decide they're better off as friends.

Clarissa's school guidance counselor, Ms. Cheesebrow, makes Clarissa try more 'normal' activities, such as Home Ec and Cheerleading. But Clarissa soon learns that one person's normal is another's abnormal.

After helping Sam to land a new girlfriend, Elise Quackenbush, Clarissa feels left out when Sam cancels his plans with her to spend more time with Elise.

Clarissa gets chosen as the understudy for the lead in the school play. She is extremely happy about this 'easy job' until the lead comes down with sore throat on opening night. Ferguson tries to 'help' Clarissa learn her lines in time, but secretly has her memorizing the lines to several other different plays.

Clarissa's plans for a slumber party are ruined when her parents go away and ask overbearing Aunt Mafalda to stay with the kids.

Clarissa and Ferguson are left home for the night and try to scare each other with a huge war of spooky pranks. However, they both end up being scared out of their wits when someone tries to come inside the house.

After Clarissa accidentally walks out of a clothing shop while wearing a piece of lingerie that she didn't pay for, she has nightmares about being a hunted criminal. When Clarissa doesn't want to tell Sam what's bothering her, it causes tension in their friendship.

Clarissa and Sam sign up for the school intern program to help them get aquainted with the real world. Clarissa ends up as Mr. Ander's intern and Sam is Mr. Darling's intern. However, trouble ensues when they both get annoyed with each other's fathers.

After a commercial producer spots Marshall in line at the grocery store, she chooses him as 'the perfect face.' However, Marshall starts taking his new role as a male model a bit too seriously.

Ferguson's new friend, J. Elliot Fundsworth III is the founder of the Junior Yacht Club and Ferguson will do anything to join. However, trouble ensues when Ferguson realized that J. Elliot is really only interested in Clarissa.

Clarissa is chosen to represent her school at a poetry banquet after her computer helps her write a strange but well-loved poem.

The annual family vacation to Lake Winnemucca is usually filled with doom and disaster. This year the family decides to give the Grand Canyon a try as a change of pace. Trouble ensues when all plans for the upcoming vacation start to go wrong.

Clarissa learns a few lessons about responsibility when she becomes the editor in chief for her school newspaper.

When Clarissa decides to protest against animal testing at Woolcott Industries, she and Sam end up getting arrested! But afterward they can't decide whose parents they should call from the police station.