Arrow's Mr. Terrific will step up in this year's Arrowverse crossover "Crisis on Earth-X." According to Curtis Holt actor Echo Kellum, the tech genius-turned-vigilante will have a bigger role to play when Nazis from another world invade Earth-1. During a set visit, Kellum previewed his role in the multiversal event, which will see him interact with more characters and leave a "bigger footprint."

"I'm really excited! Curtis, aka Mr. Terrific, definitely has a bigger footprint in this crossover than last year, and I think he really helps figure out some stuff on what's going on with 'Crisis X,'" Kellum shared.  "I know I can't be too specific, but definitely a much bigger imprint this year in these crossovers than last year. I think the fans, audience, critics are gonna really have some cool things to say about 'em after it's all said and done, rather."

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"Last year, I was so happy to get to work with Cisco and Flash and Supergirl, and then this year, we really just expanded upon that," he added. "I got to work with pretty much all the Legends guys and some other people from Supergirl. My daughter and I watch Supergirl together, so it's really cool to send her pictures and whatnot, so yeah. I mean, we really just put on everyone in the crossovers, and it certainly will be a cool experience to see like 35 amazing people, talented, awesome actors and superheroes just thrust together, in these different scenes, all coming together for the common good and the common focus and common purpose to shut down denizens of Earth-X, and they're trying to break out all havoc on our Earth."

"I can say that I wasn't there for the wedding," he revealed. "I think Barry and Iris make a cute couple. Especially the actors that play those characters. I think they have a lot of chemistry and they bring a lot to those respective characters, and together, I think we show more of what's great and you really see some interesting dynamics and dichotomy of their relationship. Even earlier this year on Flash, them going to couples counseling and stuff like that and just dealing with their life, it's really cool to see them get to that place where they can be in this union together."

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Asked if his character has any chemistry with the Ray, who is also gay, Kellum said, "You know, I think they have a little chemistry. We had some fun scenes that we shot together, and I would definitely be interested to see Curtis get out there in any capacity, especially with other superheroes. I think that would be really cool."

This year’s four-part crossover “Crisis on Earth-X” will air across two nights, beginning Monday, Nov. 27 with Supergirl and Arrow (on a special night for one week only) and concluding Tuesday, Nov. 28 with The Flash and Legends of Tomorrow.