The DC Universe has a abnormally high percentage of crime committed by gorillas. There's the whole thing with Gorilla City, Gorilla Grodd, Titano, the white ape form of Ultra Humanite, The Mod Gorilla Boss, and when gorillas are not commit crimes, Superman is probabaly trying to marry somebody to one. It's time the heroes did something about it.
They've created a special Task Force just to deal with gorilla, ape, monkey, and various other simian crime.
Meet, the Banana Bunch (Note: first order of business, coming up with a better name.)
This isn't one of those teams that's is always together and hangs out in a special headquarters or anything, this is one of those groups that comes together when they get the summons.
The team consists of
FLASH (Wally) who is acting leader simply because he's one of the few heroes with a recurring gorilla enemy in his rogue's gallery.
Animal Man and Beastboy: They are able to use the apes own abilities against them. Also, don't they sound like they should already be a crime fighting duo? Go ahead and say their names together.
Congo Bill/Congorilla: When the adventurer Congo Bill rubs his magic ring, his mind is transferred to the body of the great Golden Gorilla (and the gorilla's mind is put in his body.) Later comics had him permanently in gorilla form, but honestly, that isn't nearly as much fun as a guy that can swap bodies witha gorilla, so let's undo that.
Detective Chimp: Because you gotta have Detective Chimp
Plastic Man: He just heard about the team and thought it sounded fun.
Robot Man: Because the exact opposite of an evil gorilla is a robot with a human brain. Don't question it. It's science.
Rima the Jungle Girl: You gotta have a jungle girl on a team like this and Rima used to be one of the super-friends. Plus she gets bonus points for having unique look and not just being girl in an animal skinned bikini.
Blue Beetle and Booster Gold: These two didn't realize people were being serious when they asked for volunteers for the anti-gorilla team.