It looks as though one of the Arrowverse's key romantic relationships will be altered by the upcoming Crisis on Infinite Earths crossover event.

On The CW's Supergirl, Azie Tesfai's Kelly Olsen and Chyler Leigh's Alex Danvers are currently an item. And while the two characters have certainly grown a lot as a couple, they've still get to take the plunge and bust out "the 'L' word." However, Tesfai teases that the events of Crisis could very well spur them on to take their relationship to the next level.

RELATED: Routh's Clark Kent Reveals a New Job Title in Arrowverse Crossover Photo

"Kelly and Alex haven't said 'I love you' yet, but they grow in their relationship," Tesfai said in an interview with Michael Ausiello. "The crossover is chaos, and I think amid chaos everybody kind of shifts and changes."

Tesfai -- who was recently promoted to a series regular on Supergirl -- explains that early in the show's fifth season, she has more scenes that don't have anything to do with the relationship than scenes that do. Rather, she finds herself tangled up with the technology-based, Black Mirror-esque storyline.

"[Kelly] thinks tech is for good, and it ends up putting her life in danger," she said. "She misses seeing the bad in a lot of people this season."

RELATED: Supergirl: J'onn J'onzz Is Tested in New Photo Set

Returning Sunday, Oct. 6 at 9 p.m. ET/PT on The CW, Supergirl stars Melissa Benoist as Kara Danvers, David Harewood as Martian Manhunter, Mehcad Brooks as Jimmy Olsen and Chyler Leigh as Alex Danvers.

"Crisis on Infinite Earths" begins Sunday, Dec. 8 at 8 p.m. ET/PT on Supergirl, then continues in Batwoman on Monday, Dec. 9 at 8 p.m. ET/PT and in The Flash on Tuesday, Dec 10 at 8 p.m. ET/PT. After the winter hiatus, the crossover will conclude on Tuesday, Jan. 14 in Arrow at 8 p.m. ET/PT and in DC's Legends of Tomorrow at 9 p.m. ET/PT.