Rumors of a Space Sheriff Gavan and a Special Police Dekaranger crossover film has surfaced online due to some interesting posts made by some of its cast members.
YouTube user k2eizo posted his video review of the Gokaiger Ranger Key Set - Lost Edition. The set contains the Rangers that only appeared once in a TV episode, movie or direct-to-video special.
To promote the upcoming Blu-ray and DVD release of the Special Police Dekaranger: 10 YEARS LATER film, we see the Dekarangers dance the Ninninger ending theme dance.
Here's the TV ad for the Special Police Dekaranger: 10 YEARS AFTER V-Cinema, which aired today.