Next week's episode of The Flash, titled "Grodd Lives", features the return of Gorilla Grodd. But, while we wait for new clips from that episode, we have a photo gallery for The Flash Season 1 penultimate episode "Rogue Air", airing Tuesday, May 12 at 8 PM ET on The CW. This episode may even be bigger than Grodd's, with these photos revealing a slew of superhero and super villain appearances as we get closer and closer to the season finale.

This new episode finds Barry still trying to figure out a way to defeat Wells (Tom Cavanagh), after he once again gets the upper hand on the S.T.A.R. Labs team. Barry (Grant Gustin) realizes he needs to make a big move and reaches out to an old foe, Captain Cold (guest star Wentworth Miller), for help. Joe (Jesse L. Martin) and Caitlin (Danielle Panabaker) warn Barry that Cold can't be trusted. True to form, Cold has his own agenda that involves the meta-humans trapped in the containment cells. As things seem to be going from bad to worse, The Flash gets reinforcements - Arrow (guest star Stephen Amell) and Firestorm (guest star Robbie Amell).

"Rogue Air" marks the first time that real-life cousins Stephen Amell and Robbie Amell will be seen together on the small screen. With Robbie Amell's Firestorm already confirmed for the Arrow / Flash Spinoff, there's certainly a chance we could see Arrow and Firestorm working together again. Following "Rogue Air" is the season finale "Fast Enough", airing on Tuesday, May 19, although no plot details have been released quite yet. While we wait to learn more about the last few episodes, check out these photos from The Flash below.