The Flash producer Andrew Kreisberg previously confirmed Grodd’s return in season 3 during the Television Critic’s Association summer press tour, revealing Team Flash will be heading to Gorilla City for a two-episode arc.
Still, fans of The Flash hoped to see Grodd again as well as a much closer look at Gorilla City (which was originally shown from a distance), and his return has been promised for some time.
Season 2 of The Flash also introduced the multiverse, with particular attention paid to Earth-2.
Now, we have an idea of when Grodd will be seen again on The Flash.