The 100: Season 2 Spoilers From The Set

"We're still dealing with The 100 realizing and experiencing this radiation-soaked planet where things aren't as we as humans now recognize them and see them," Marie Avgeropoulos previews. "That's something you're going to see this season is a lot of different changes of creatures and environment.

"Her challenge to begin with is just getting the hell out of there," Eliza Taylor says of Clark, who begins Season 2 in the same white room we left her in. She makes it out (spoiler alert!), but her position as a leader will be tested as her strange behavior "raises some questions amongst the kids who used to look up to her." As for Clark's reunion with her mom, Taylor admits her character has "mixed emotions."

"She's trying to fit in somewhere," Marie Avgeropoulos says. "Octavia feels like she hasn't really belonged anywhere her entire life. She's really finding who she is a person and as a young woman with the Grounders. I feel like she connects with them a lot more than her own people." As for her romance with Grounder beau Lincoln, look for the pair to constantly be tested. But "Lincoln's always been there for her, and she'll do whatever it takes to repay that courtesy even if it has to be with her own life or sacrifice the loyalty that lies with her and her people."

"I'm off with Octavia in the wilderness, obviously trying to keep her safe," Ricky Little shares. "It's creating that tension, that urge to get back together. It'd be nice and it would be great if everyone was together. That's what everyone wants. So we're going to try and build that tension by keeping everyone apart and just creating that kind of urgency to try and find everyone again."

The Mount Weather leader is "a seemingly creepy dude, but also really friendly in the beginning," Eliza Taylor describes. "So it's sort of one of those characters where you go, 'Is he a really nice guy or is there something more to it?' [He] tells [Clarke] how things are run and the lay of the land in Mount Weather, and she's trying to just figure this guy out."

Unlike Clarke, the pals are very happy with their new Mount Weather digs — there's chocolate cake! — and Jasper even hits it off with a resident.

"It surprised me completely," Lindsey Morgan raves of the season premiere. "When I got the script and saw who I was paired with in my first scene, I was floored because it was the last person I ever thought Raven would be interacting with, especially right off the bat. I love it because it's such an interesting dynamic and such an uncomfortable one. Extremely. Because Raven is completely vulnerable, and she's paired up with somebody who is very dangerous, but also extremely vulnerable."

Despite a history of troublemaking, it sounds like Kane is focused on the greater good in Season 2. "He's trying to find a way to survive, and to survive — he thinks — is through peace with the grounders," explains Henry Ian Cusick. As for Kane's relationship with Abby, Cusick admits, "There's always a little bit of friction there, but we do confide in each other. It's the kind of relationship where you see us come together, [but you also] see us argue. We're never entirely comfortable with each other."

To call Abby a reluctant leader in Season 2 would be a grave understatement. "Abby initially doesn't want the pressure," Paige Turco admits. "But at the same time, somebody has to do it, and because of what happened in the Ark, it's about owning your own power." That said, Abby might not want to get too comfy in her new position. Turco adds, "There will be an interesting dynamic with the people that are left that did have power."

It's true: Though Isaiah Washington's character appeared to meet his demise at the end of the Season 1 finale, you will see him again on Wednesday's premiere — and he's got a little surprise up his sleeve! 

The arrival of the adults on Earth and their desire to impose their rules on the ground is "a massive change" for the unofficial head of The 100, Bob Morley reveals. "He's kind of taking a back seat from that leadership role. I think he's finding it very hard. There's a lot of restraint that he has to show. But it's a huge change from the way it was in the first season where he would act before thinking whereas now he's grown a lot."

Last season's pacifist "is questioning everything, especially who he is," Lindsey Morgan previews. "Finn is going through a huge metamorphosis of what he thought he was and who he is. He's really confused."