'The Flash' Teamup Sets Stage for Final Reverse-Flash Battle

The Flash Arrow Firestorm - H 2015
Diyah Pera/The CW

[Warning: spoilers ahead for Tuesday's episode of The Flash, "Rogue Air."]

The Flash is speeding to the finish line.

Barry (Grant Gustin) fought off a staggering array of villains and teamed up with two of his closest allies in Tuesday's episode, all on his way to a final showdown with Reverse-Flash (Tom Cavanagh) in next week's finale.

See more 'The Flash': Every DC Character on The CW Series

Barry called upon Arrow's Oliver Queen (Stephen Amell) and particle accelerator victim Ronnie Raymond (Robbie Amell) to help him battle Reverse-Flash in the episode's final minutes. Thanks to an assist from the two, Barry subdued his former mentor, but Wells' future tech will soon reboot the particle accelerator, and even Cisco (Carlos Valdes) doesn't know how to stop it.

That leaves two major questions for the finale:

1. Will Barry time travel to prevent his mother's murder?

2. Will Reverse-Flash make it home to the future?

Cavanagh told The Hollywood Reporter last week there would be a definitive answer to the questions posed earlier in the season, so stay tuned. Other key developments from the episode:

Eddie and Iris broke up. Wells unleashed Peek-a-Boo (Britne Oldford) from the STAR Labs prison, and in the process of containing her, Team Flash discovered Eddie was being held in STAR Labs as well. Just as importantly, Iris (Candice Patton) found the ring Eddie had intended to propose to her with. But Eddie ended his relationship with Iris, citing the future newspaper showing Barry and Iris end up marrying each other.

STAR Labs got an ethics lesson. The team had to grapple with the fact that they've been keeping a whole slew of metahumans imprisoned beneath STAR Labs without due process. Wells' plan to turn the particle accelerator back on necessitated that the team move the prisoners, or else they would be killed in the resulting blast. The only problem? Keeping them had been illegal, and no other prison could hold them, so Barry devised a plan to move them to Lian Yu, the island Arrow's Oliver Queen was stranded on before the series started. That didn't work out well.

Barry is not Oliver. Barry attempted to take a page from Oliver's playbook — enlisting Captain Cold (Wentworth Miller) and his sister Lisa (Peyton List) to help escort their fellow badguys to Lian Yu in a Con-Air type situation. But Captain Cold double crossed Barry, helping The Rogue escape. In a heart-to-heart, Joe (Jesse L. Martin) gave Barry advice to not try to be as extreme as Oliver, but rather to stick to his own, gentler methods.

Speaking of Oliver, Barry will make an appearance in Wednesday's Arrow finale, with executive producer Marc Guggenheim telling THR, "if you watch episode 23 of Arrow with 23 of Flash back to back, Barry goes straight from Arrow into the season finale of Flash."

Stay tuned to The Live Feed for more from The Flash and Arrow.

The Flash airs Tuesdays at 8 p.m. on The CW.