Phineas Flynn is a boy in the Flynn-Fletcher family, and the 2nd Dimension counterpart of Phineas Flynn. Stuck in an area which is ruled by Dr. Heinz Doofenshmirtz, he has grown up without summer vacation and has never heard of it.
Across the Second Dimension
"Are there four of you in this room?"
"I see nothing, I have plausible deniability."
"The days are longer..."
"...The nights are shorter..."
"...The sun is shining..."
"...It's also...Surfing tidal waves..."
Uh-oh, we don't like the sound of all this.
"....It's ice cream cones...."
"....Where do we Begin?"
"Are you part of the resistance?"
"Isabella's house is right this way."
Phineas wondering if they can generate enough energy to reverse the portal.
2nd Dimension Phineas and Ferb find their not-evil-anymore Perry