Not looking forward to performing in Helga's "The Four Food Groups" musical, Arnold and Gerald decide to take the bus a few stops too many, but end up stuck downtown.

An obsessed Helga steals Arnold's hat to complete her shrine to Arnold, which is hidden in the back of her closet. But, she notices how miserable Arnold is without his hat, and decides to give it back to him.

Arnold has a really bad day - the city is suffering from a heatwave, and whatever he does, Arnold just can't seem to get cool.

When the kids complain of being bored, Grandpa tells the story of the Haunted Train. So, the kids decide to go and see if the train exists for themselves.

When Arnold gets mugged in the street, Grandma teaches him how to defend himself, but the training and fighting starts to get to his head.

Arnold and the gang play on a basketball team, but their coach tells them to throw the ball to one person, his son, Tucker.

Arnold loses Grandpa's watch inside the sewers, so he must retrieve from The Sewer King.

Gerald's secret is revealed; he doesn't know how to ride a bike, so Arnold teaches him how.

An organ grinder's monkey kisses Helga, who's convinced she has caught 'monkeynucleosis'.

Arnold and Gerald go around the city following "Porkpie", a mysterious man caught on film. They suspect, because of the clues, that Porkpie are planning to kill "Marty", who turns out to be Mr. Green.

In this variation of "The Tell-Tale Heart", Phoebe plagiarizes from a poetry book and uses one of the poems as her entry in a poetry contest. She wins, with her prize being a trophy resembling poet Emily Dickinson. Then, the trophy haunts Phoebe into confessing.

Helga uses Stinky as her boyfriend to try to make Arnold jealous.

The ghost of a former boarding house resident is believed to have been causing strange occurrences in there when Arnold and Gerald find an old pair of glasses believing to have belonged to him.

After finding out that his idol is a haughty, primped actor, Eugene sets out to become bad.

While feeling the effects of laughing gas, Helga leaves a confessional message of love on Arnold's phone machine. She then has to get into the boarding house in order to erase the message.

Sid pretends that Arnold's room is his, since he's ashamed of showing his real room to Lorenzo.

Stinky's simple life changes after he becomes the surprise new spokesman for Ya-Hoo Soda.

When Bob has to go to a business meeting, Miriam and Helga are forced to go on the family road trip by themselves.

P.S. 118 is holding a Spelling Bee, and Helga wants to win one trophy to get out of Olga's shadow, but Pheobe has to back out of the competition for Helga to make it.