Phineas and Ferb The Movie: Across the Movie: Across the 2nd Dimension

For the last day of summer, Phineas and Ferb re-build everything they've the built all summer long and tries each one out. When they try the Platypult out, they land in Dr. D's building again, where he finishes building his movie-inator. Phineas and Ferb travel through it and end up in "Phineas and Ferb The Movie: Across the 2nd Dimension" and they go along with the movie until it ends, where is when they are automatically transported back.