Barney's Adventures of Muppets Most Wanted is a Barney/Muppets crossover film which will appear on YouTube in the nearby future. It will be part of a back-to-back double feature with its preceder, Barney Joins The Muppets.
As an exact follow-up to the last film, Barney and the gang join the Muppets on their world tour. However, they unknowingly run into trouble when an evil Kermit doppelganger named Constantine, co-working with an evil Barney impersonator named Sidney the Pink Dinosaur, swaps places with Kermit in order to complete an international jewel heist, working alongside Boris Badenov, Natasha Fatale, Nefera De Nile, Carmen Sandiego, and Hans.
- Ferb Fletcher, Phineas Flynn
- Vanellope von Schweetz
- Boris Badenov, Natasha Fatale
- Carmen Sandiego
- Draculaura, Frankie Stein, Nefera de Nile, Toralei Stripe
- Prince Hans
- Ronald McDonald
- There's an extended version of We're Doing a Sequel sung, featuring Barney, The Cat, Ariel, Vanellope, Toralei and more.
- Sam, Clover, Alex, Stan Smith, Francine Smith, Hayley Smith, Steve Smith, Garfield, and others appear in this film.
- It's revealed that Boris and Natasha are good/bad friends with Dominic.
- Some cameos and their actors will be filled in by certain characters (in order):
- The "unnecessarily" extended version from the Blu-Ray will be used to film it.
- The last few lines after Together Again (Again) are cut and are replaced with the one after Summer Belongs to You from Phineas and Ferb.
- This takes place after Charlie Brown and Snoopy Join Anastasia.
- Barney Theme Song