"Supergirl"/"Flash" Crossover To Feature Jealous Jimmy Olsen

With the highly anticipated "Supergirl"/"Flash" crossover episode just a few weeks out, the upcoming adventure was a hot topic during "Supergirl's" panel during last night's PaleyFest LA event. As reported by IGN, the episode will feature on-screen the off-screen chemistry between series lead Melissa Benoist and "Flash" star Grant Gustin.

"I'm most excited for you guys to see the chemistry we got to enjoy on the stage and out on the day," said executive producer Ali Adler. "Grant's amazing, I worked with him a little bit on 'Glee' as I did with Melissa back then, and they're friends, so it is nice to see their camaraderie. It's nice to have a light episode where they're having fun. You can clearly see that."

"For once she's like, 'Oh my god, it's someone like me!'" said Benoist.

Adler added that this chemistry "makes James [Olsen] a bit jealous." Mehcad Brooks, who plays Olsen on "Supergirl," explained his character's take on the super hero meet-up. "He's a superhero and so is Kara, and James cares for Kara a lot," said Brooks. "They've got that connection that he doesn't have. He's kind of like, 'What am I supposed to do?'"

The episode might just answer an often asked question, Adler teased. Viewers might find out definitively who is the fastest hero alive -- Supergirl or the Flash -- in the episode.

"Supergirl's" crossover with "The Flash" airs on March 28 on CBS.

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