Also, it may be noted, that one the main mysteries surrounds the other 'Agent P', Peter Panda! PANDA! Never say no to PANDA!!! (Inside joke, sorry.)
According to Disney's Blog, "This episode has time travel, strange happenings, and polar bears...[and a] long line of LOST plot twists. It is definitely one episode Phineas and Ferb fans and LOST fans will watch over and over again to catch all the details."