Patrick Harbron/ABC
February 02, 2015 at 12:00 PM EST

Henry’s biggest foe will return to Forever on Tuesday, but he may actually come in peace.

After murdering a series of people to test Henry’s (Ioan Gruffudd) resolve, Adam (Burn Gorman) has been missing in action, but the discovery of stolen Nazi antiques will bring him back to New York.

“We start to get into World War II and Adam comes back in and is able to fill in some missing pieces about Abe’s [Judd Hirsch] past that Abe didn’t know about, so it’s an olive branch that he offers to Henry that is a very hard thing for Henry to say no to,” executive producer Matt Miller tells EW. “Henry adopted Abe when he was a child. He doesn’t know a lot about his family, and Adam is able to help him learn some of that. It’s a really emotional, really good episode.”

During the episode, viewers will finally get a sense of what Adam’s past looks like, which may bring out surprisingly sympathetic feelings—though Henry certainly won’t let his guard down with his fellow immortal just yet. “It’s uncomfortable for Henry to have Adam in his life at all for a variety of reasons,” Miler says. “Henry thinks he’s a psychopath and it also draws more attention to Henry and his condition.”

Heading towards the finale, Adam and Henry will be on a collision course as more details into their affliction are revealed. “How do you kill an immortal?” Miller says ominously. “If you can kill an immortal, what does that mean for Henry and what he wants? If Henry is given the figurative smoking gun that could end his life, would he use it?”

Forever airs Tuesdays at 10 p.m. ET on ABC.

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