Live-action adventures of Timmy Turner.
Thirteen years after the timeline and finale of the original series, Timmy Turner has grown into a 23-year-old adult, but maintains a lifestyle of a 10-year-old, despite being an adult. He has done so to keep his fairy godparents. Timmy's refusal to mature greatly irritates his parents (who desperately encourage him to move out) and Jorgen von Strangle, who is constantly scheming to entice Timmy into giving up his fairies.
Following his previous adventure, Timmy Turner is assigned a summer job in Fairy World's Yuck Factory by head fairy, Jorgen Von Strangle, who believes that as he is grown up, he should work for a living due to him being grown up, something his own fairies agree upon. Timmy, despite not being happy he will not be able to enjoy a summer vacation, chooses to do so in order to impress Tootie, who now works for the Help Creatures Dimmsdale Research Center. Returning to Dimmsdale from his latest day of work, Timmy visits Tootie at the Center and discovers, much to his disappointment, that the head of the Center wishes her to deliver a special gas cure for rare spotted dolphins to Hawaii, which will be contained in a vial in the same size and shape as Timmy's lip balm. In mix-up and totally unaware of it, Timmy sets his lip balm down by the gas cure, which is inadvertently packed away into a travel case by mistake while he takes the cure's vial. Later, upon returning to home, Timmy is shocked to discovers that his parents are also going to Hawaii, after Mr. Turner's pencil company chose it for the company's next vacation. Mr. Turner further reveals that he has been put in charge of providing the entertainment in the form of a fire dance and been given the money to do so, only to learn from Timmy after reading the note his boss gave him in more detail, that he will be fired if he fails to provide. Meanwhile, two children from a rich family, Marty and Mitzy, are excited about going to Hawaii, until they learn their parents won't be going, instead sending them off with a babysitter, who turns out to be Vicky, much to their chagrin. Game over again!
The film continues from the events of ''A Fairly Odd Movie: Grow Up, Timmy Turner!'' Timmy Turner (Drake Bell), his fairies (Cosmo, Wanda, and Poof), and Tootie (Daniella Monet) have been traveling around the world, granting wishes for others.
Ty Turner uproots his life to reunite with his high school sweetheart, Rachel Raskin, in the town of Dimmsdale, thrusting his cautious 13-year-old daughter, Viv, into a new world where she does not fit in. Once there, Viv’s cousin, Timmy, entrusts his fairy godparents, Wanda and Cosmo, to help her adjust by taking her under their wings. Witnessing the fairy transfer take place, Viv’s charismatic new stepbrother, Roy, also inherits them, and the two siblings must take turns making wishes. Together, they learn to overcome the obstacles in their path, all with the help from their new wand-wielding and wish-granting fairy godparents.