Timmy loans his godparents to Tootie on her birthday to make up for a lousy one.

Timmy is at the beach and he’s bored silly. He, Cosmo, and Wanda set off to explore the deep, and everywhere they go, but Cosmo seems to be hated by every single fish. Soon, they end up in the lost city of Atlantis. Timmy appeals to Atlantis’ leader, King Greg -- if he can show good cause why Atlanteans should be happy beneath the sea, Cosmo will be set free. Will Timmy save Cosmo?

Sick and tired of his father's bad haircuts, Timmy wishes for indestructible hair with a personality that can't be cut. It then comes to life as it grows and almost destroys Dimmsdale. Meanwhile, Wanda takes Poof to the baby fairy barber shop for his first haircut.

Timmy wishes Cosmo was a talking car so that he and his fairies can search for the missing Mama Cosma.

Timmy's wish for a magical car wash that rejuvenates anything that goes through it so his father can restore his beloved Striker Z sports car, but fossils of dinosuars and cavemen also go through it causing them to come back to life and run amok in Dimmsdale, as do Cosmo and Wanda, turning them into rebellious teenagers.

When Timmy doesn't get what he wants for Christmas he simply wishes for it. However since his friends can't do the same, Timmy wishes every kid could get a magical coupon that would allow them to wish for the one thing they didn't get. But when Vicky gets her hands on one of the magical coupons, her greed throws Christmas all out of balance.

It's up to Timmy to save the universe from the Darkness, a large black hole that could destroy the universe by sucking out all the light and magic in it. Jorgen then sends all the fairies to Earth in order to hide. Timmy then sees some anchient cave drawings that claim that he is the "Chosen" sent to defeat the Darkness by finding three powerful magic wands with the help of Cosmo, Wanda, and Poof, but the Darkness then sends his minions, the Eliminators, to hunt Timmy down throughout the universe to destroy him before he could find those wands.

Timmy learns he merely slowed down The Darkness and now he must seek a second wand to defeat this evil force. Timmy is forced to make amends with his enemies in order to fight for the betterment of mankind.

Confident and secure, Timmy feels great after defeating The Darkness as his world turns into a paradise for him; however, he soon discovers that it is all an illusion and that he didn't win, but is now living inside The Darkness. Now his family, his friends, and even his enemies on the outside must rescue him and help him find the third and final wand in order to defeat The Darkness once and for all.

Timmy looks forward to his birthday until Jorgen reminds him that each birthday draws him a year closer to losing his fairies; however, Timmy isn't worried because his folks always forget his birthday, but he then panics when they seem to remember it this time.

When Poof's anti-fairy counterpart, Foop, is born, it is up to Poof to save his loved ones and Fairy World from him.

Everybody in Dimmsdale is watching the latest horror film, "Fly Boy". But Timmy isn't allowed to, so when he wishes to become a "fly on the wall" in order to see it, the real horror begins.

Vicky becomes Timmy's friend after he saves her life.

Cosmo's brother, Schnozmo, comes to visit, claiming to be a secret agent But when he turns out to be nothing but a con man, Wanda makes him take part in a real spy adventure to spare Cosmo's feelings.

When Timmy envies his mother's life, Wanda makes makes them swap bodies for a day on a bet that if Timmy finds a mother's life easier, Wanda will have to spend a week as a chicken; otherwise, Timmy will have to go a week without magic.

Timmy's Dad becomes obsessed with proving his neighbor, Mr. Dinkleberg is evil. He enlists Timmy to help him spy on Dinkleberg by dressing up like a girl scout!

When Jorgen von Strangle gets the trick-ups (bouts of fairy hiccups that cause bouts of cheesy magician-like parlor magic) he isn't able to enforce Da Rules, so he must pass it on to his closest available relative until he gets better. Unfortunately, his closest available relative is his long-lost cousin Cosmo as his Nana Boom Boom was playing Explosive Bingo and his cousin Leonard Von Strangle was on a trip in the Bahamas.

Centuries ago, the Anti-Fairies and Fairies started an annual bake-off to determine which species gets godchildren, this year, Jorgen von Strangle's recipe is at risk, and Anti-Cosmo and Anti-Wanda are determined to make sure they make Timmy their godchild by stealing the recipe and cheating the fairies out of the competition.

When Cosmo and Wanda bring Timmy back through time to meet their former Godchildren, his interactions with them alter the future.

When Dad forgets all of the supplies for the Squirrely Scouts camping trip, Timmy tries to smooth things over with scary stories around a campfire.

When Poof has trouble falling asleep, Wanda tries to help by reading him a book of classic fairy tales.

When Jorgen discovers that Cosmo never graduated from the Fairy Academy, he threatens to take away his job as a Fairy Godparent. To solve the mystery of what happened, the gang looks through Cosmo's memories of his teenage years.