In the Season 4 opener, Birthday Girl kidnaps meteorologist Sonny Days and demands that he announce her birthday on TV. Later, Becky suspects Seymour Smooth is up to no good when he delays announcing his new show's winning ticket numbers.

Dr. Two-Brains has big plans when the Butcher fills in for one of Two-Brains' henchmen; WordGirl battles the hiccups while Chuck tries to get his condiment ray fixed by Hal Hardbargain.

Mr. Big is arrested, leaving it to his assistant, Leslie, to carry out their latest evil plan: building the world's most powerful mind-control device; WordGirl learns that Dr. Two-Brains is on an all-out cheese rampage just as she's about to give a tour of her secret hideout to the winner of the WordGirl Synonym Contest.

Chuck teams with his brother Brent and tries to turn the city into a giant sandwich; Bampy helps WordGirl stop Granny May's latest plot: exchanging gold jewelry for purple yarn.

Becky babysits TJ while Mr. and Mrs. Botsford celebrate their anniversary at an ice-cream parlor that just happens to be the target of the Whammer's wrath; Dr. Two-Brains forces Hal Hardbargain to create a ray that turns superheroes into cheese.

Villainous Victoria Best sets out to be the best superhero in the city in order to force WordGirl into retirement; TJ makes and sells WordGirl bobblehead dolls.

Ms. Question devises a devious plan to get rid of WordGirl: eliminate all of the city's villains so WordGirl is no longer needed. Elsewhere, Scoops joins Capt. Tangent's pirate crew in order to write a newspaper article about them.

Becky's birthday party is interrupted once too often by citizens in need, leading her to wish on her birthday candles for a world without WordGirl. Afterward, she realizes that her wish came true: Chuck is now king and the city is very, very different.

The Butcher kidnaps Reginald the jeweler in order to use his expertise to plan his next heist; Ms. Davis holds a recycling contest to raise funds for a new playground after the old one is decimated by villains.

The Learnerer steals a giant diamond; Mr. Big employs mind control to make sure his dinner-theater show is a success.

A carnival is endangered by the Energy Monster; WordGirl battles Granny May, who's plotting to steal Cleopatra's bed from a museum.

Tobey builds a robot replica of WordGirl that he names WordBot; all the grown-ups go missing.

Lady Redundant Woman uses nefarious means to circumvent the city's congested traffic; Tobey brings a game about evil robots to Becky's house in hopes of exposing WordGirl's true identity.

Scoops joins Capt. Tangent's pirate crew in order to write a newspaper article about them.

Vocab words: Vessel, Publish

Today is Becky's birthday, and her parents have planned her "the greatest party EVER!" Becky is extremely excited and antsy to start partying. What's first in store is an enormous Pretty Princess bouncy castle, which Becky wants to jump in right away. However, she picks up with her super hearing a robbery at a sandwich shop. Bob hears it too, and reminds her of her obligation to protect the city. Reluctantly, Becky transforms into WordGirl and flies to the shop, where she finds Chuck robbing it. Chuck says that he wants people to eat only sandwiches made by him, and doesn't want anyone else to make them. After some complaining from both people and a definition of "antsy", WordGirl ties up Chuck and tells the shop owner to keep an eye on him until the police arrive.

Vocab words: Obligation, Antsy

After a brief summary about the previous episode, Becky is still trying to figure out about the changes in the city. She starts by asking her parents what they put in the cake, and after getting no helpful response, she looks at the empty cake mix box. Confused by the "Warning: If electrified, cake may become enchanted" label, she finally realizes that this was probably a birthday joke, "getting Chuck to pretend he's the king of the city". Seeing her parents confused by her remark, Becky realizes that it's not a joke, and the cake really was enchanted. Wanting to investigate, she makes an excuse to leave with Bob. She sees that all the shops are sandwich shops and that there are statues of Chuck everywhere. One suddenly makes an announcement that "it's time for Sandwich Talk", and hearing this, a couple of citizens start replacing certain words with sandwich-related words, such as "I really mayonnaise your coat" or "It was a bargain at mustard dollars and ketchupy-ketchup cents". Peeved by such nonsense, Becky stands up to correct them.

Vocab words: Enchanted, Unusual

The Butcher kidnaps Reginald the jeweler in order to use his expertise to plan his next heist.

Vocab words: Formal, Fret

Ms. Davis holds a recycling contest to raise funds for a new playground after the old one is decimated by villains.

Vocab words: Dedicate, Calamity

The Learnerer steals a giant diamond.

Vocab words: Suffix, Misjudge

Mr. Big employs mind control to make sure his dinner-theater show is a success.

Vocab words: Embellish, Leery

A carnival is endangered by the Energy Monster.

Vocab words: Guzzle, Monstrous

Tobey is determined to get WordGirl back for constantly destroying his robots, so he builds a robot clone of Word Girl, named WordBot. But when the robot gets jealous of the fact that Tobey is speaking mostly to WordGirl herself, and turns on its creator, WordGirl and Tobey are forced to team up to fight back.

Vocab words: Devoted, Backfire

When all the adults go missing in Fair City, the kids are taking advantage of a parent-free world. But when it starts to take a toll on them, WordGirl discovers that Mr. Big is using a mind-control device to make all the adults build a tribute in his honor. Will Word Girl be able to destroy the machine and save the adults?

Vocab words: Advantage, Tribute

Lady Redundant Woman uses nefarious means to circumvent the city's congested traffic.

Vocab words: Obstacle, Rant

Tobey brings a board game about evil robots to Becky's house in hopes of exposing WordGirl's true identity.

Vocab words: Savvy, Realize