Phineas and Ferb Season 5 Episode 18a Entrance Exam Episode Title: Entrance Exam Episode Description: Monogram’s diagnostics send Perry popping through entrances while Carl gets stuck in the tunnels, his echoing voice convincing Candace the Mysterious Force is speaking to her. Phineas and friends build an elaborate Arnold Palmer machine, perfected only when Ferb adds mint. A misfired lair entrance launches the drink rig onto Doof’s vacation inator, creating a perfect beverage for him. Perry resets the system, Carl is freed, and Candace once again arrives too late to bust anyone.