How many movies have Gary Cole and Sam Register collaborated on?

They have worked on 3 movies together! Their first movie together was Batman: Under the Red Hood (2010) while their highest rated movie together was Scooby-Doo! Shaggy's Showdown (2017). They have not worked together since Scooby-Doo! Shaggy's Showdown (2017). They are most known for their animation films together.

Scooby-Doo! Shaggy's Showdown (2017)

Role
Rafe (voice)
Crew
Executive Producer

DC Showcase Original Shorts Collection (2010)

Role
Jim Corrigan / The Spectre (segment "The Spectre") (voice)
Crew
Executive Producer

Batman: Under the Red Hood (2010)

Role
Bobo / Commissioner Gordon / Shot / Guard (voice)
Crew
Executive Producer