To avoid obvious spoilers, we didn't post the image as our main tag. Below is an image of Grodd for the upcoming episode of The Flash. Below that you can even watch a very spoiler filled trailer, however, if you're excited to see it unfold, I would skip the trailer.
For those who don't know, Gorilla Grodd is a hyper-intelligent telepathic gorilla (you read right) with the power to control the minds of others. At one time, he was nothing more than an average ape, but after an alien spacecraft (retconned from a radioactive meteor, the same one that empowered Hector Hammond) crashes in his African home, Grodd and his troupe are imbued with super intelligence by the ship's pilot. The series appears to be making it so that Harrison Wells created Grodd, but this is to make it suit the show better.
Grodd and fellow gorilla Solovar also develop telepathic and telekinetic powers. Taking the alien as their leader, the gorillas construct a super advanced home named Gorilla City. The gorillas live in peace until their home is discovered by prying explorers. Grodd forces one of the explorers to kill the alien and takes over Gorilla City, planning to conquer the world next. Solovar telepathically contacts Barry Allen to warn him of the evil gorilla's plans, and Grodd is defeated. The villain manages to return again and again to plague the Flash and his allies. Grodd has made many attempts in the series and comics to turn everybody on Earth in to monkeys and apes.