User blog comment:PerrythePlatypus/what happens in season 3.... You decide!!/@comment-5151799-20110213233345/@comment-2240628-20110215092619

One of Doof's inventions causes the teleporting machine to grow larger again and Phineas and Ferb accidentally go into the machine at the same time. Doof's invention becomes a disinegrator (well his invisibility ray can also be turned to a disintegration ray) and they have to build another machine to bring their own bodies back