In The Fairly Odd Phantom, Danny Phantom and friends capture escaped ghosts in their lab, Fenton Works, but their mission quickly goes awry when secret agent Dudley Puppy messes with the control panel. Soon after, Wanda, Cosmo and Timmy end up in the lab instead of Fairy World, where they are all met by a very different newcomer, Bunsen.
The short starts out with Danny, Sam, Tucker and Jazz standing in the lab. Danny says that the Ghost Portal is acting weird, and then three ghosts pop out of it. Danny transforms, and Sam, Jazz, and Tucker help him take care of them.
The foursome see that Dudley Puppy is messing with the Ghost Portal controls, Kitty Katswell watching him in displeasure. The alarm goes off again, and this time, Timmy Turner, Cosmo, and Wanda step out. Timmy makes a remark that the lab isn't Fairy World, and Danny mistakes Cosmo and Wanda as ghosts and sucks them into the Fenton Thermos.
The alarm goes off one last time and a beast named "Bunsen" steps out. Bunsen thinks the group is there for a party and gives everyone cupcakes. Dudley eats all, but not Timmy's for a weird reason, and Danny responds, "New rule, from now on, only people with pants are allowed in the lab."
- Tara Strong as Timmy Turner
- Daran Norris as Cosmo
- Susanne Blakeslee as Wanda
- Grey Griffin as Sam Manson and Kitty Katswell
- David Kaufman as Danny Phantom
- Rickey D'Shon Collins as Tucker Foley
- Colleen O'Shaughnessey as Jazz Fenton
- Jerry Trainor as Dudley Puppy
- Jeremy Rowley as Bunsen
- This is the first crossover between Fairly OddParents and Bunsen is a Beast. They crossed over again in Bunsen's episode "Beast of Friends".
- It is unknown if this short is canon to the shows. However, if it is canon, it means that that all Butch Hartman shows exist in the same universe. This would also mean the TV shows Jimmy Neutron and Planet Sheen also exist in that same universe because of the Jimmy Timmy Power Hour trilogy.
- This is the only Bunsen is a Beast media made in hand-drawn animation.
- This marks the Danny Phantom and T.U.F.F Puppy characters return to animation since both their shows ended.
- All voice actors reprise their roles from their respective shows.
- Chloe Carmichael and some of the main characters from the other shows do not appear in this crossover short.