When "DC's Legends of Tomorrow" kicks off its second season, the Waverider will be getting a little crowded.

The Season One finale culminated with Hourman, a prominent member of the Justice Society of America, or JSA, delivering a cryptic message to our heroes shortly after they defeated the Time Council. His presence signaled the coming of more JSA members, including the previously announced Vixen, Stargirl, Obsidian and Citizen Steel. But will the combined might of the Legends and JSA be a match for the newly formed Legion of Doom? And are too many superheroes a good or bad thing?

RELATED: How Will the Justice Society Fit Into DC’s Legends Of Tomorrow?

Victor Garber, who portrays Professor Stein, aka the unseen half of Firestorm, spoke with CBR about Stein's role on the team, the Justice Society of America, visiting different eras and Firestorm's evolution. In addition, Garber discussed his Beyond Type 1 charity and living with the terrible disease.

CBR News: Season Two ended with the arrival of Hourman. In what ways did the warning he delivered sway the Legends' course of action when we pick up with them six month later?

Victor Garber: We were united with a whole other group of people where there's a huge competition between them. That's established in this season, and then there are the repercussions of that. It changed everyone's life, really. Now we're dealing with a larger group of villains. Everybody is working together to save the world again. The interaction with the JSA is quite a fun thing to happen this season.

On "Alias," your nickname was "Spy Daddy." How much do you feel Stein is the father figure of the Legends group?

To a larger degree, it's just a question of, I'm the oldest person, and the fact that Jefferson is so much younger. There's a personal aspect to our relationship that is crucial to our show, and for me as an actor, which I love. I also love that Stein suddenly becomes aware of the fact that he may not be as knowledgeable as he thinks he is. To see the arrogance and hubris of Stein makes it fun. Of course, like everything, he gets cut down. That's the fun of the character for me.

Stein and Jefferson didn't always see eye to eye last year. What is their current dynamic?

There's still a competition. They've always cared about each other, but it's a deeper bond. That's much more apparent this season than last.

Firestorm only seemed to tap into a fraction of his potential. What's the learning curve with his powers?

I don't know. The transmutation aspect was established and is now becoming more of a reality. That's about it at this point. I don't really know where it will go from there.

What kind of pairing can we expect between Stein and the JSA members?

Mostly, he's trying to find a way to work together. Stein is a diplomat. He's always making an attempt. Sometimes it fails and sometimes it works. Vixen, from the JSA, comes to join Legends. That relationship evolves over the season

The Legends have ventured into the past and future. What are some of your favorite time periods to visit in upcoming episodes?

I find them all challenging and all interesting. We were just in the '40s in a Nazi night club -- that was interesting. Next episode, we'll be in Chicago with Al Capone. It's fun from a visual standpoint, but I don’t have a favorite. I read the scripts and think, "Oh, how will I do that?"

"Legends of Tomorrow" previously introduced Stein's younger self, revealing new aspects of your character. How much are we going to learn about what makes him tick this season?

You are going to learn a lot more. Young Stein comes back in this season! There are repercussions from that meeting that are pretty major. Just when Stein thinks he's doing the right thing, he realises that it has an effect that maybe isn't as good as he hoped.

In addition to "Legends of Tomorrow," you've been busy raising awareness and funds for Type 1 Diabetes. Why is that cause near and dear to your heart?

I was diagnosed with Type 1 Diabetes at age 12. I've been insulin-dependent since then. I'm older now. I'm 67. Beyond Type 1, which is the organization I'm involved with, is trying to raise money for the charity. If people go to my Instagram page, they can read a little of my history and why this organization is so important. As you know, people don't really understand the difference between Type 1 and Type 2. They are vastly different diseases and both are very serious. Juvenile Diabetes, which is the other name for Type 1, is rampant. A lot of people need support and to know we aren't alone in this. I'm the face of someone who has achieved what I wanted to achieve, along with having Type 1 Diabetes. This is really about education and to raise awareness and money for a cure.

What are some of the misconceptions about diabetes?

When I tell people I'm a diabetic, most people say, "Oh, you can't eat sugar." It's so much more than that. If somebody in your school or office is a Type 1 diabetic and you don't really understand the difference between a low and high blood sugar, a person could die. Schools don't do blood tests when kids come in with flu symptoms. They think they have the flu, but the sugar is high. With a simple blood test, they would be able to determine what's wrong. It's an important thing to me. I just want people to get information. People who know Type 1 diabetics would benefit from this as well.

Airing Thursdays at 8 pm ET/PT on The CW, "DC's Legends of Tomorrow" stars Arthur Darvill as Rip Hunter, Brandon Routh as the Atom, Victor Garber and Franz Drameh as Firestorm, Caity Lotz as White Canary, Maisie Richardson-Seller as Vixen, Dominic Purcell as Heatwave and Nick Zano as Citizen Steel.