Team up to save the Tri-State area The Disney Channel\'s most popular duo of all time have arrived on PSP for a dimension-hopping adventure to foil the evil Dr Doofenshmirtz and save their home town of Danville When Phineas and Ferb accidentally transport themselves into an alternative dimension - along with Phinehas\'s sister Candace Dr Doofenshmirtz and their pet Perry the Platypus - they kick off a crazy adventure that turns the world as they know it upside down After meeting their alternative selves and discovering that Perry is actually super-secret spy Agent P they find themselves pursued through space and time by an evil other-dimension version of Dr D and his army of deadly cyborgs hell-bent on destroying the Tri-State area Now back in Danville - or at least a place that looks a lot like Danville - Phineas and Ferb will need to load up on power-packed gadgets and hook up with a whole cast of playable characters if they want to find their way back to their own dimension rescue their friends and save their home town