Earth-55
This Earth is probably one of the most ridiculous ones you'll find here.
It's history seems to diverge before recorded time when objects called "Shen Gong Wu" first showed up.
Another factor seems to be a man known as Father Time's tendency to go back in time and bring people with him. This however tended to get things messed up even further for example the Boston tea Party happened in a manner similar to Monty Python's "Cheese Shop Sketch".
Superheroes also exist there albeit in small numbers the most powerful one for example is Washington DC's Freakazoid. Other ones such as Lord Bravery and The huntsman in England would prove to have powers that Freakazoid's is vastly superior to.
Villains plague the Earth prime examples are Dr. Phineas Phibes who would actually be dangerous if it weren't for his largely incompetent henchmen.
On this Earth the Justice League does exist but In smaller numbers, to fill the gap is a group of humanoid dogs called the Road Rovers who while not the most powerful group is in fact one of the few superhero groups operating on this Earth.
Dr. believes that this Earth shouldn't pose much trouble however on an island inhabited completely by fruit he discovered a coconut that can warp reality just by thinking.
Deciding that such power would make his plot easier he lead an assault on the island only for a stray thought to send him and his minions into a New Jersey landfill.
Further attempts to gain a military advantage failed when his plot to steal technology that was built and owned by the infamous Test Sisters predictably failed.
When later talking to a business partner (a pirate calling himself Sir Crocodile) he referred to this Earth as "more trouble then it's worth."