It's invasion of the bodysnatchers this season on The 100, and while that should definitely freak everyone from Spacekru out, the one person we're not surprised to see take advantage of this shift in power is John Murphy (Richard Harmon).

After Josephine revealed to him that she was not, in fact, Clarke Griffin (Eliza Taylor) but an immortal Prime who'd taken over his frenemy's body, she offered Murphy the one thing he simply could never pass up: immortality. That's in exchange for being her "Clarke coach," of course, which would require him to betray the people closest to him. According to Harmon, that's a pretty impossible deal to turn down, and not just because Murphy's at a pretty vulnerable point in his life.

Discover Your New Favorite Show: Watch This Now!

"I think Murphy did what he had to do in the situation. There's no sort of choice really," Harmon told TV Guide. "I don't know, some people are mad at him for it, but she told him this horrible secret, we're in their home pretty much, [so] the chances of Murphy actually getting out of it if he's like, 'No, I refuse you,' is not good. She'll probably just kill him. I think he had to at least feign interest, but I'm not saying that he was feigning interest either. I think that that's something that he very much wants. Right now he wants it more than ever because he is a broken man currently. He's just weak. He's a broken, weak man, currently and that's been a lot of fun to play."

Harmon is obviously alluding to that unknown "hell" Murphy thinks he's going to based on what he saw when he was temporarily dead. Whatever he saw before being revived scared him enough to drive his already ruthless survival instincts into overdrive, which is influencing "damn near 100 percent" of his decision making at this point says Harmon.

Richard Harmon and Bob Morley, The 100

Still, the decision of whether to betray his friends, and to what degree, will definitely be eating at him in the upcoming episode, especially when it comes to Bellamy (Bob Morley), who he's grown very close to over the course of the season. Not to mention, Murphy will also have to contend with Clarke's death via erasure, which Harmon says he may be taking harder than we'd expect.

"They were definitely not in a good place when Clarke died. However, I know that he didn't want her to die," Harmon said. "So he is mourning that a little bit. It's kind of like [when] you're in a family with a sh--ty person, which Murphy thinks Clarke is. I'm sure Clarke thinks Murphy is the same even though they have some weird level of respect for each other. They've done enough to each other at this point that it's not the best relationship on the planet — or the moon, I suppose, in this case. But when you're part of that family, that doesn't mean you want them to die, it just means you have your differences. So he is mourning a little bit."

The 100 Boss Explains How Murphy's Brush With Death Will Dramatically Change Him

To make it even more complicated, he's going to have to mourn Clarke while dealing with the sociopath wearing her face at the same time, which can't be easy. If there's one person who can give Josephine and her sass a run for her money though, it's Murphy, and their dynamic is going to be one fans can really sink their teeth into.

"I think the relationship between the two of them is going to be a very interesting one to watch," Harmon teased. "I don't think he's found a new best friend in Josephine. I don't think they're going to be the tightest of peas in a pod."

Let the battle of the sociopaths begin, we guess?

The 100 airs Tuesdays at 9/8c on The CW.

(Disclosure: TV Guide is owned by CBS Interactive, a division of CBS Corporation.)