How many movies have Laura Dickinson and Richard O'Brien acted in together?

They have worked on 2 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 Movie: Candace Against the Universe (2020). They have not worked together since Phineas and Ferb the Movie: Candace Against the Universe (2020).