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Season 4:

Challenge of the Superfriends:
Nemesister terrorizes the town and the only one's who can stop him are Imaginary Man and his new sidekick Mac. Bloo becomes jealous of Mac's new friend and teams up with Nemesister.

The Big Picture:
Mac and Bloo look at old photos of the gang at Fosters over the years and end up seeing a photo with only Madame Foster and Frankie in it. Where did all the friends go that year? Mac and Bloo along with Goo try to find this out.

Squeeze the Day:
Everyone other then Bloo and Mac go to the beach for the day and Bloo and Mac try to do the most awesome thing ever with everyone is gone.

Neighbor Pains:
On adopt a thought day Bloo gets in a funny-face off with the little boy living across the street; the grandson of the friend hating Old Man Rivers. Bloo ends up throwing crumpled up adoption form at Rivers causing a huge rescue mission for the forms.

Infernal Slumber:
The gang shows up at Mac's house uninvited for a slumber party and Mac has to get them out of there before they wake up his mother.

I Only Have Surprise For You:
Bloo is planing another surprise party for Mac and Mac wants no part of it.

Bus the Two of Us:
When Bloo takes the Foster's bus for a joy ride (dragging Mac along with him) Wilt tries to keep Frankie and the others from knowing that the bus is gone.

The Big Cheese:
Mr. Herriman buys a security system to keep the ever dropping by Cheese out of the house. But when Herriman sets the code completely randomly the only one who knows it ends up being Cheese!

Bloo's the Boss:
Jealous of Madame Foster's friend rescuing skills, Bloo opens his own adoption agency for imaginary fiends.

Emancipation Complication:
After braking an Abe Lincoln!pen friend out of the teachers closet Lincoln and his sidekick try to take over Foster's by adopting out all the friends as workers and turning the house into a casino.

Make-Believe It Or Not!:
When the power goes out on a rainy day Mac, Goo and the gang turn to their imagination to have fun. But latter that night when Goo goes to bed her dreams make the characters from their game of make believe come to life.