By Natalie Abrams
February 29, 2016 at 05:57 AM EST
Michael Yarish/CBS
  • TV Show

Monday’s episode of Supergirl may have you seeing double. And no, Bizarro Girl isn’t returning.

Laura Vandervoort, who portrayed Supergirl on Smallville, kicks off a multi-episode arc as the supervillain Indigo, who was sentenced to Fort Rozz after turning on the people of Krypton. Below, the actress discusses returning to the world of DC, sharing the screen with another Supergirl, and the perks of going dark:

ENTERTAINMENT WEEKLY: What was it like stepping back into the world of Supergirl?

LAURA VANDERVOORT: It was great. I played Supergirl years and years ago, but being asked to be a part of the Supergirl series was really something I was excited about. I had seen the show and was really excited when I heard the casting news for it. Stepping into the DC world again, but as a villain, was a nice change for me and something I was excited about.

What can you tell us about Indigo?

Indigo is actually a living, strong-willed supercomputer. She’s a villain that’s able to transport via the Internet. She’s equally as dangerous digitally as she is physically in her form. She’s actually showing up to cause trouble for Supergirl, but we don’t quite know what her goals are at this point. You’ll find out later on. How she shows up is she hacks an Ashley Madison sort of website and leaks the client info to Cat [Calista Flockhart]. You also find out that she’s got a unique connection to Kara’s past, which will be revealed in the episode.

What is Indigo’s dynamic like with Kara (Melissa Benoist) in the present?

Kara, at this point, doesn’t know what Indigo’s true intention is, but she does have to travel to the Fortress of Solitude to learn how to fight Indigo. It’s something she’s never come across before and she’s figuring it out as she goes. She’s an equal strength to Supergirl at some point throughout the episodes.

Is there anything you can tease of why she was imprisoned on Fort Rozz?

I can’t. I like to believe she is the most dangerous of the Fort Rozz villains, but I don’t think I’m able to say why she was there. That’s something you’ll find out in the coming episodes that she’s in.

In the comics, she’s a version of Brainiac, which is funny because we saw Brainiac on Smallville. How does she compare to that one?

Actually, on Smallville as well, I had an episode where I played Brainiac. It’s a different version for sure. Similar to how it was different on Smallville, Supergirl the series has a different take on the characters, which I think is great; it’s time for a change. It’s definitely a different version than we saw on Smallville.

What kind of interaction does she have with the other characters on the show?

She does have interactions with a few characters on the show, Winn [Jeremy Jordan] included, because he’s the tech guy of the series, but there’s also some interactions with James Olsen [Mehcad Brooks], Alex Danvers [Chyler Leigh], even with Hank [David Harewood] and Cat, in a way; not directly. I got a chance to play with everyone on the show. It’s been a lot of fun. I’m really trying to find the unique qualities in Indigo. A lot of the character is driven by how she looks. It’s the first time that the exterior has impacted the interior for me as a character, where once I put the suit on and saw how the stunt girl moved, I realized that was the character of Indigo — very calculated and very specific.

What was that makeup process like?

Goodness. It’s about three to four hours. It’s my first time doing this extensive hair, makeup, prosthetics, wig, the whole nine yards. It’s cool. It really transforms everything about what I’m doing. It was fun to feel that change as the blue went on, as the wig went on and then you put the suit on. It’s definitely a whole new world.

There’s talk of a scene between all three Supergirls, with you, Melissa, and Helen Slater. What was that like to shoot?

I can’t tell you because I haven’t done that yet, so I don’t know if that’s actually going to be the case. I have another episode to go, so we’ll see. Hopefully that comes up.

Have you at least been swapping Supergirl stories with Melissa?

A little bit. On our first day of shooting, we were just talking about the majority of stunts that we’ve both had to do, and what kind of stunts I was doing on Smallville versus what she’s been doing. This is an entirely different Supergirl, so if she wanted to discuss any of it, I’d be happy to, but we were really just talking about the wire work, green screen and that sort of thing. She’s doing a great job.

In the comics, Indigo was a superheroine-turned-villain, so could she possibly turn good and align with Supergirl?

I think there’s always that possibility with comic-book characters. They can switch sides rather quickly depending on what works best for them. Indigo is such a conniving character that I think she would do whatever works for her. Not to say she will or won’t switch sides, but she’s definitely on the bad side at this point.

Was it nice for you to tap into the evil side this time around?

Oh yeah. I always believe it’s a little more fun to play bad. Although I’ve played my share of good characters, this I’m able to have more fun with. It’s a whole array of emotions for her, because she is so slimy that, at a point, she’s got a sense of humor to her, but she’s also very evil and dark. I get to play all the realms of emotion with Indigo. If you’re playing a good character, you really can’t go dark very often. It’s been pretty fun. I’m having a blast figuring out her personality.

What’s been your favorite part of playing this character?

There’s a lot of things about her that I’ve been enjoying. Just her mysterious presence and the fact that she uses a bit of her sexuality to get what she wants, but in a very strong, alpha sort of way. It’s been fun working with other actors and figuring out physically how she’s going to move around them to get what she wants.

Supergirl airs Mondays at 8 p.m. ET on CBS.

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