Barry Allen enlists some help from some unexpected places as he prepares to fight Reverse Flash in an extended trailer for next week's episode of The Flash, "Rogue Air", airing Tuesday, May 12 at 8 PM ET on The CW. This new trailer shows that Harrison Wells/Reverse Flash has reactivated the particle accelerator, as Wells plans to kill off the rest of the "metahumans." Barry hatches a plan to move them all, which forces him to reach out to one of his enemies, Captain Cold (Wentworth Miller).

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). What's interesting about the last scene with Stephen Amell, is that he appears to be wearing his League of Assassins attire, and yet he's still helping Barry, after promising to sever ties with everyone in his past life.

After "Rogue Air", the first season finale, "Fast Enough" airs on Tuesday, May 19 at 8 PM ET on The CW. How do you think this hit new show will bring its first season to an end? Let us know what you think after checking out the trailer below.