Bloo and the Friends think Mac is moving away forever, so they set out to make his last day at Foster's the greatest he's ever had.
Bloo and the Friends are forced to choose between staying upstairs and staying outside while Frankie and Mr. Herriman host an important party at Foster's.
Several recently adopted Imaginary Friends start to paint a less-than-rosy picture of life outside the house through a series of letters sent to Foster's.
What starts as an innocent dare turns into a house-wide competition that pits the friends against each other in a bid to win the title of Dare Champion!
Bloo imagines he is engaged in another hair-raising adventure as the Bloo Superdude, but in reality, he is just deliriously sick and trying to attend Mac's birthday party.
Mac and Bloo become locked in an epic competition when Bloo challenges Mac to a thirty mile race from the arcade back to Foster's. Will Mac win?
After rain forces the cancellation of a trip to a water park, the friends turn to making fun videos of each other and posting them to the internet.
A bug infestation at Foster's forces Mr. Herriman to move the Friends to a hotel for the night, where Bloo's antics spark an all-out prank war.
When the front door of Foster's is accidentally left, open, Coco escapes and goes on a wild and wacky adventure that spans the globe.
Mac turns to detective, Jackie Khones to help him solve the mystery of who checked out library books in Mac's name and never returned them.
Fed up with Mr. Herriman's strict ways, the friends devise a plan to "mellow him out", but when it works and he starts slacking off, Foster's starts to fall apart! Now, they are forced to put things right and turn him back into his old stodgy self.
In a companion episode to "The Big Cheese", Mr. Herriman has locked everyone out with the home's new security system, but a pint-sized friend named Peas is accidentally left inside! Now it us up to Peas to save the day by figuring out a way to get the front door open.
In an attempt to be cooler, Eduardo has started telling tall tales to the little friends in the Foster's nursery. But when one of those friends is moved into the big house, Eduardo panics and must stop him before he is exposed for being a liar.
It's Halloween and Bloo is bent on doing the ultimate trick, but when it goes wrong it sets off a chain of events that end up turning all of the Imaginary Friends into Zombies!
A power struggle develops over who gets the prize of two tickets to a movie premier when Frankie and another friend inadvertently help Mac and Bloo to win a radio contest.
When the young heir to Paddle Ball World Incorporated, arrives at Foster's Home in search of an imaginary friend, paddle ball obsessed Bloo secretly goes behind Mac's back to make buddy buddy with the new boy. Bloo must decide between the ever mystifying automatic paddle ball and his best buddy Mac.