Foster's Home for Imaginary Friends, the mansion where imaginary friends lived after they were brought in by their creators and owners due to outgrowing them and remained there before being adopted by a new person, may be a place of fun, wackiness, and adventures and this was for the one person that comes very often to this place, mostly after 3-o-clock in the afternoon: an 8 year old boy named Mac who mostly comes to meet up with his "best friend", an anthropomorphic blue blob by the name of Blooregard Q. Kazoo, or "Bloo" for short, that he created five years prior and make sure he doesn't get adopted like he promised him the day he was introduced to the mansion. Yet other friends that he's close to and get along with in the mansion includes Eduardo (a large, horned, Mexican monster with a kind and gentle heart), Wilt (a very nice and kind red imaginary friend who loves basketball and has been in the mansion for years), Coco (an imaginary chicken-plane-pineapple hybrid who only says "Coco!"), and Frances "Frankie" Foster, the 22 year old beautiful, attractive, red-haired care-taker of the mansion and granddaughter of Madame Foster (the founder and owner of the mansion). The mansion is headed by Madame Foster's imaginary friend (and Frankie's boss), Mr. Herriman, a giant gray anthropomorphic rabbit with a top hat, tuxedo, mustache, and monocle who's a tyrannical, sadistic control freak.

However, as fun, colorful, and whimsical Foster's Home for Imaginary Friends can be, there is a dark side to this mansion, and has skeletons buried deep within their closets.

Ever since Bloo was first introduced into Foster's, he has become more of a cocky, self-centered, obnoxious, unpleasant, whiny narcissist and jerk who always causes trouble, mayhem, and serious problems, doing actions that are mostly illegal and unnecessary, gets on everyone's nerves, including Mac, cares more about himself than anyone around, and doesn't learn his lessons from his actions. But there was one incident (and catastrophe) he created that was so bad, so cruel, so sadistic, so unforgiving, and so evil and unpleasant, that it turned not only Mac's life, but the entire Foster's Home and its denizen's upside down.

Every year, Bloo humiliates Mac by throwing him birthday surprise parties and even gets his mother and his older brother Terrence and his school classmates in on it. The first surprise party, when Mac was five, by having everyone greeting him while he's in the shower. The second annual surprise party was forcing Mac to drink from a dog bowl like a dog by replacing ketchup with hot sauce and turning off the water from the sink. The third humiliation is having Mac wear tutu instead of his towel after his shower. Because of these, Mac detests surprise parties and despite Mac telling him to stop doing every year, Bloo never listens and still continues to do those. And that's where things start to go horribly wrong!

As Mac arrives at the Foster's Home, he notices that Bloo is giggling about something. Because of this and it's around the exact day he dreads, Mac thinks that Bloo is throwing a surprise party for him in which Mac really HATES and cannot stand, due to getting tormented, ridiculed, and humiliated by them. Mac then gets paranoid with everyone in Foster's, thinking they're working with Bloo, despite that they rudely told him otherwise, while Bloo constantly tells him that there was no party going on, but Mac doesn't believe , he asks Mr. Herriman to make sure Bloo doesn't throw a surprise party for him and embarrassed in which Herriman agrees. But even with that, Mac see's that Bloo and many of the other residents of the mansion, including a young girl named Goo (who has been coming to the mansion very often since she first met and befriended Mac) carrying a large birthday present, are getting prepared for a surprise party and hears a lot of rumors of a surprise party. Because of this, Mac gets scared, terrified, and anxious. He then goes crazy and went on a violent rampage in his Rambo-like outfit as he tries to stop Bloo and the others from throwing the embarrassing party, destroying two parties, its accessories, and ruining Frankie's cake, only to be told by the rest of the Foster's residents that the second birthday party in the library he destroyed was for a "four-year old imaginary child" named "Artie" "created by" Goo. As it made "Artie" running away in tears, Mac gets chastised by Mr. Herriman and the Foster's residents were all mad at him and HATE him for ruining "Artie's birthday", with Frankie, Eduardo, Goo, Coco, and Wilt giving him the cold shoulder while angrily leaving him to wallow over his misery. Saddened, emotionally hurt, and feeling guilty about it, Mac begs Bloo to make this all up to "Artie" and so, the blue blob agrees and the two cleaned up and re-did the whole party and have everyone arrive. After that, Bloo forces Mac to dress up and act like a clown in front of everyone, because 1) "Artie" loves clowns, 2) it is the only way to cheer "him" up and 3) as a price Mac had to pay for ruining "his" birthday. So, reluctantly Mac does as Maco the clown and once again, humiliates himself and gets ridiculed. During it, it's revealed that "Artie" was Madame Foster in disguise, and it turns out, that the party WAS for Mac. This turned out to be another plan from Bloo of what he calls the B-Team he led: have Mac destroy two parties, then have him feel so bad that he'd make another party, and this time humiliate himself. The whole Foster's Home (except Eduardo who was just told to come in through an invitation, even though he's not completely innocent), including Frankie, Wilt, Goo, Coco, Mr. Herriman, and Madame Foster had all tricked, betrayed, and lied to him this whole time as a rule set up by Bloo and Mac himself is left to suffer deliberate humiliation at yet another surprise party that doesn't even celebrate his birthday. To add insult to injury, Bloo said that he'll always be one step ahead of Mac, causing him to leap into the cake when he tried to attack him in retaliation, much to everyone amused, laughing and making fun of the poor kid, and Bloo, with a sadistic grin gloat to him "One! Step! Ahead!".

But what neither Bloo, nor Frankie, Eduardo, Coco, Goo, Wilt, Mr. Herriman, Madame Foster, and all the residents of Foster's Home for Imaginary Friends that are all part of the B-team realized that they all have crossed the line and gone off the deep end and are about to pay a price for their terrible deed and mistreatment to Mac. And already, while humiliated, ridiculed, and taunted and buried in the birthday cake, Mac's blood is boiling, his face is fuming red, his teeth grit and grind, his eyes are bloodshot, his muscles tightened, and his heart is pounding.

This would be the last straw, the final nail in the coffin.

Residents that were B-team members and were on Mac to humiliate himself are:

-Blooregard Q. Kazoo (Leader and mastermind)

-Madame Foster aka Artie

-Mr. Herriman

-Frances Foster

-Goo

-Wilt

-Coco

-Eduardo*

-One Eye Cy*

-Jackie Khones

-Fluffer Nutter

-Pokey Toehair

-Iris

-Scissors

-Mabel Licorice

-George Mucus

-Sunset Junction

-Sassyfrass

-Mr. Edmonton

-Yogi Boo Boo

-Preparation Ape

-Myopic Patootie

-Phineus B. Vurm

-Burple Bear

-Keystone Blop

-Pinecone Cola

-Socket Tubey

-Myron Giant

-Jethro Precious

-Clambake

-Ramone

-Moptop

-Balloon-headed guy

-Big Fat Baby

-Bingo

-Stoolie Dan

-Madame Mustachio

-The Tortoise in the Air

-Paper

-Rock

-Blue baboon-like friend with spots

-Long-necked friend with a hat

-Red, monster-like friend

*:Eduardo and Cy were the only residents that did not take part of humiliating Mac via surprise party due to the former being told to come in through an invitation and the latter being interested in interior design, but they're still not completely innocent as they guilt-tripped and mock and laughed at Mac.

Note: For the aforementioned list of residents that took part of the sadistic B-team, I didn't rewatch the actual evil episode for obvious reasons. I use the Foster's Home wikia, the Watchmojo video "Top 10 Cartoon Character Changes That Made Fans Rage Quit", and the episode's end credits. So, if there are some that I missed, write it in the review. There's also some I couldn't find their names are, so please help and correct me on these ("Balloon-headed guy", "Blue baboon-like friend with spots", "Long-necked friend with a hat", and "Red, monster-like friend"), please!

I don't own anything!

Ed, Edd n Eddy is created by Danny Antonucci at aka Cartoons

Foster's Home for Imaginary Friends is created by Craig McKracken

Both by Cartoon Network