User blog comment:Poptropica411/Phineas plus Isabella equals Phineas and Ferb: Across the Second Dimension in Fabulous 2D?/@comment-66.231.41.140-20110228203631/@comment-5151799-20110228205056

I don't recall the press release saying that Isabella would be occompaning them on their journey. (I remember it said "Phineas, Ferb, and Perry" but no "Isabella"). Besides, I don't see what she could do that the three of them couldn't do, besides, she'd learn Perry's identity by doing so, and I'm sure the O.W.C.A. wants to keep Perry's identity as secret as possible.