EXCLUSIVE: 'Supergirl' Melissa Benoist and Chris Wood Dish on Karamel's 'Sweet' Relationship!

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Love (and music!) is in the air on The CW's next superhero crossover event!

Kara and Barry are trapped in a musical dreamland on this Tuesday's all-new episode of The Flash -- and only ET's cameras were allowed behind the scenes to get the inside scoop from the stars on the special's most swoonworthy moments.

"You're going to experience some singing, there's some dancing, you might have guessed that, and there's just gonna be some love," Supergirl star Chris Wood dished to our cameras last month when we were on set in Vancouver. "It's all about love, really, and musical theatre."

​​EXCLUSIVE: 'The Flash' & 'Supergirl' Musical Crossover: Behind-the-Scenes of Kara & Barry's Tap Dancing Duet!

So what can fans expect when the Girl of Steel, in particular, is placed under the Music Meister's (played by Glee's Darren Criss) siren song?

"Kara needs to work through some stuff that she's come to learn about Mon-El and they're not in the best place when the episode begins," Wood explained. "And then she gets sort of sent to this weird musical apocalypse, 40s-ish world and she has to try to figure out how to get out."

The CW

Luckily for Kara and Barry, there are two very concerned loved ones who are desperate to wake them from this dreamy, music-filled prison. "Iris and Mon-El are teaming up they're like, 'We love these guys and they're not here. What should we do? Let's help them!' because that's a great thing to do in musicals," he said with a laugh.

Supergirl herself, Melissa Benoist, confessed that Kara and Mon-El's blooming relationship has been one of the highlights of season two. "I mean, what I've loved about it the most is that Kara this season has totally been coming into her own and learning how to be a woman," Benoist revealed.

"Last season, she learned how to be Supergirl. And, now, she's coming into her own more as an adult and, obviously, balancing love with everything that goes with that, so I love it," she gushed. "I think it's a really sweet thing that she's learning about herself."

EXCLUSIVE: 'The Flash's Grant Gustin Spills on Barry and Iris' Big Romantic Milestone: 'It's Really Sweet!'

"[Melissa and I have] found this nice pocket for the characters to live in," Wood added. "It was just so easy to play and she's just so generous as an actress that she just keeps it rolling. She makes it easy."

When we asked Benoist if she personally is a fan of Kara and Mon-El as a couple, the actress was sweetly coy with her response. "I'm a fan of Kara being happy," she beamed.

The CW

Wood, on the other hand, was a bit more boastful with his appreciation for Karamel's on-screen connection. "How could you not? It's a delicious treat that goes on everything," he joked before adding that Karamel "might be" the best shipper name currently on TV.

In fact, we at ET have even coined a new term for this extraterrestrial twosome: OTA – aka one true alien. "That's great!" Wood exclaimed approvingly through a fit of laughs. "High five! OTA."

For even more behind-the-scenes videos and articles from our on-set visit, keep it locked to ETonline and follow @LeanneAguilera on Twitter!

The musical crossover extravaganza kicks off on the Monday, March 20 episode of Supergirl and continues on Monday, March 21 at 8 p.m. on The Flash.