Season 3 is an attraction at Phineas and Ferb World.
There is no line for the show, because it is nonstop and all you do is walk into the theatre.
It is a movie theatre with all of the season three episodes playing in order. Once all of them are played, it restarts. Food, and drinks are allowed in, because the purpose of the place is for if your family wants to relax and have a snack or sit down they can go here and watch the show.