Jenna Dewan-Tatum as Lucy Lane in Supergirl

Jenna Dewan Tatum has joined CBS’ “Supergirl” as Lucy Lane, the younger sister to Lois Lane and former flame of Jimmy Olsen (Mehcad Brooks). Her arrival in National City is met with mixed feelings by Olsen and Kara Zor-El (Melissa Benoist), but Dewan Tatum tells Zap2it that Lucy really does have good intentions. She also reveals that she’s definitely playing the role knowing that Lucy becomes Superwoman in the comics, plus four more tidbits about her character.

Lucy has unfinished business

“Lucy is a very ambitious, strong, powerful, smart yet warm person. I really love that the producers created this character without the intention of her being this evil ice queen who comes in to break up America’s sweethearts,” says Dewan Tatum. “She has a strong history with James — they are and were very much in love — and there’s a lot of unfinished business there. She comes to right her wrongs in that relationship.”

RELATED: Knowing ‘Supergirl’ comics’ references could provide storyline clues

Kara and Lucy are not enemies

“She and Kara are friends, Lucy’s not some total diva b****y ice queen,” says Dewan Tatum. “Lucy loves Kara .. she has not even an inkling of an idea that there is a relationship between Kara and James, so she really looks at Kara as an ally. She just moved to town, she doesn’t have any friends, she has good intentions for Jimmy and she thinks Kara is such a great person — she genuinely wants to be her friend.”

But that doesn’t mean there are no bumps in the road

“For Kara it’s a little hard because I have such history with someone she’s in love with, but at the same time she thinks, ‘I really like this girl, I want to be her friend.’ The producers make a really real relationship rather than what may be expected with this love triangle,” says Dewan Tatum. “But not everything is what it seems, of course.”

“Lucy is developing as I’m playing her. There’s no secret that I’m hiding as of yet, let’s put it that way. But there’s a lot of history with her and her life and her father and with Jimmy Olsen,” the actress continues. “There’s a lot of secrets and history that comes out.”

Speaking of Lucy’s father …

“It’s a very complicated, tense relationship. She has a lot of love and respect for her father, she was the ultimate daddy’s girl,” says Dewan Tatum. “She wants to work with him, work well for him, but there’s a moral predicament that she finds herself in between her father and Jimmy.”

RELATED: 5 things ‘Supergirl’ needs to do to keep soaring

General Lane isn’t Lucy’s only complicated familial relationship

“[Lucy and Lois] don’t have the closest relationship,” says Dewan-Tatum with a laugh. “Lois was always the one that got all the attention and a lot of the accolades, and Lucy tended to be the one that people pushed aside. She was the underdog and people didn’t give her the same respect and attention that Lois got.

“Lucy was pretty and not a lot of people recognized her for being a smart, powerful woman like Lois. We get to learn a bit about her relationship with Lois and the dynamic and the complications and layers that are there. It definitely wasn’t what I expected.”

A Superwoman plot may be coming

“They love to keep everything under wraps a little bit with the storylines, but I do know Lucy is Superwoman in the comics, and I know that that is an intention we’re all playing on the show,” says Dewan Tatum. “How that works, when that shows up, is all to be uncovered and I’ve been sworn to secrecy. But there are fun developments to come — I mean, who doesn’t want to play Superwoman? How amazing is that?”

Watch Lucy’s storyline play out on “Supergirl,” as Dewan Tatum confirms she is continuing on the show into 2016, Mondays at 8 p.m. ET/PT on CBS.

Posted by:Andrea Reiher

TV critic by way of law school, Andrea Reiher enjoys everything from highbrow drama to clever comedy to the best reality TV has to offer. Her TV heroes include CJ Cregg, Spencer Hastings, Diane Lockhart, Juliet O'Hara and Buffy Summers. TV words to live by: "I'm a slayer, ask me how."