Echo Kellum Talks Mr. Terrific's Journey Through Arrow's "Epic" Midseason Finale

Just because there's no Arrow this week doesn't mean we aren't eager to talk some more about it. Especially with the Invasion! crossover looming, followed by a midseason finale that promises to be pretty crazy, there's a lot of enthusiasm for Arrow online right now.

Who's particularly enthusiastic? Echo Kellum, who plays Curtis Holt/Mr. Terrific on the hit CW superhero series. Kellum has been a key player in the show's fifth season, one of a number of new recruits to Team Arrow and a series regular, up from his recurring role last season.

He's also going to be smack-dab in the center of things come the crossover episodes in two weeks -- meaning that as the show enters production on its twelfth season 5 episode, he's actually feeling pretty relaxed, all things considered.

"For sure, compared to episode 8 and 9, definitely," Kellum told ComicBook.com when we asked whether the current production load is less than it was a month ago. "It's so much fun in these episodes to get into the meat of what's going on. With the crossover, there was a lot going on and then our midseason finale is pretty epic. Things are a lot more tame now -- or as tame as they can be on Arrow."

That "epic" midseason finale puts Curtis in personal danger, it was recently revealed, as Prometheus goes after him in his personal life due to his ties to the Green Arrow.

What does this mean for Curtis and his husband, who at this point doesn't yet know that he's married to Mr. Terrific?

"I definitely think it's going to be something that's unavoidable for Curtis and his husband to deal with, at the point where Prometheus actually does that," Kellum said. "You're going to see where they are, what they decide to do from there, and where Curtis decides to go from there, in terms of if he can be a functional member of the team and stuff like that. It's oging to be a lot of emotional stuff to deal with, but what's happening is a really interesting journey for Curtis and I think when people see the final outcome of the decisions that are going to be made and the path that we're on toward our season finale, they're really going to dig it."

Another journey that's been a pleasure to watch? Kellum said he was as impressed as anybody else when he and the cast found out that Artemis was secretly an agent of Prometheus (revealed at the end of last week's episode). He noted that it puts a totally different perspective on all those scenes where she and Curtis are training together and she's beating him easily. Originally played for humor since Madison McLaughlin, who plays Madison, is so much smaller than Kellum, those sequences now seem a bit more menacing.

Supergirl airs Mondays at 8 p.m. ET/PT; The Flash on Tuesdays at the same time; Arrow on Wednesdays and DC's Legends of Tomorrow on Thursdays. All four series air on The CW. The "Invasion!" crossover will air beginning November 28.