Marvel appears determined to take their shared TV universe on to the next level with an intense production schedule being planned for their Netflix shows. "Jessica Jones" actress Krysten Ritter recently revealed that filming for the eagerly-awaited crossover series — "The Defenders" (for Netflix) and the second season of "Jessica Jones," will happen "back-to-back."

"I don't know if they'll overlap a little bit," the actress told Digital Spy during a recent interview. "It's about to be a serious undertaking. I'm starting my physical training — lots of weight training and boxing."

When asked if fans will see Jessica Jones make an appearance in the "Luke Cage" series, given her comic-book history with the superhero, Ritter said: "Marvel has this grand plan. Luke Cage will come out, then Iron Fist. In terms of scheduling I don't know how it will all come out and I can't even tell you if I've filmed Luke Cage. But I'm excited for Mike [actor Mike Colter] to have his own show."

The actress added, "I know the tone of that show is going to be very different. We couldn't expose a lot of Luke's back story because he was getting his own show, so we explored him through Jessica's point of view. I think that helped give him mystery and tees up his show."

Ritter also weighed in on the second season of her own show. Teasing what fans can expect to see in the upcoming episodes of "Jessica Jones," Ritter said the storyline will touch on many of the first season's open plot threads.

"I'm excited to see what happens next for Jessica, and the end of season one left a lot of doors open and questions unanswered. Kilgrave was her reason for getting up every morning. Saving people gave her purpose. I wonder how emotionally taxed she's going to be now. That opens a lot of doors as to who will come out and play. We all live in the same universe, so there are endless possibilities."

Netflix's lineup of upcoming Marvel shows includes "The Defenders," "Daredevil" Season 3, "The Punisher," "Iron Fist," "Jessica Jones" Season 2 and "Luke Cage" — which are all in various stages of development.