How many movies have Richard O'Brien and Thomas Brodie-Sangster acted in together?

They have worked on 6 movies together! Their first movie together was Phineas and Ferb The Movie: Across the 2nd Dimension (2011) while their highest rated movie together was Phineas and Ferb: The Perry Files - Animal Agents (2013). They have not worked together since Phineas and Ferb: Night of the Living Pharmacists (2014). They are most known for their animation films together.