As unlikely as it may sound, time is running out for "DC's Legends of Tomorrow."

Though the team has made its reputation on traveling through the past, present and future, there are still rules they must adhere too, even if they live in a time machine. And with immortal psychopath Vandal Savage not only capturing Hawkgirl and Hawkman, but disappeared into the time stream in his own ship, their options for finding their prime adversary have narrowed. Now, the team must somehow figure out where Savage has gone, not to mention how to permanently stop him before he rewrites history.

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Ahead of tonight's season finale, appropriately titled "Legendary," CBR News spoke with "Legends" executive producer Marc Guggenheim about the team's final showdown with Savage. We discuss the impact Captain Cold/Leonard Snart's death has had on the team, the role Patrick J. Adams' mysterious character plays in cementing the Legends' Season 2 mission, and the looming threat the team will face as the Thanagarian invasion of Earth inches ever closer to becoming a reality.

CBR News: In what way does the death of Captain Cold light a fire under the team?

Marc Guggenheim: Snart's death is a major blow. As you'll see in the beginning of the episode, it's a blow that is one of many. It's not just that Snart died -- it's that Kendra and Carter are still in Savage's clutches. Savage is lost in time because he now has a time machine, courtesy of the Time Masters. Things are looking pretty bad for our heroes and the state of the world. We begin the season finale with the team essentially going, "Yeah. We're screwed. There's nothing for us to do here. We've lost."

Rip has seen an Earth ravaged by the Thanagarians. How much does that future weigh on him at this point?

For right now, not that much. The Thanagarian threat is a threat that is very far out in the future. Vandal Savage presents the clear and present danger, right now. While the Thanagarians are certainly something that are relevant, and will remain relevant in Season 2, the bigger threat -- ["Legends" producer] Phil Klemmer has a great phrase: "The patient on the table is Vandal Savage."

In the beginning, these characters were very, very different in their motivations, but we've seen them gel together rather nicely over the course of the first season. How cohesive of a team are they in facing Savage this time?

It's always my preference to let the narrative speak for itself in that regard. I will say, this episode shows the team working in cohesiveness better than they did at the beginning of the year. You certainly see some evolution there.

Long before this team existed, Kendra and Carter encountered Vandal Savage time after time. What kind of closure will those two get against their immortal enemy?

I don't want to spoil anything. I'll say the end of the Savage/Kendra/Carter story is pretty definitive.

After setting the team against Vandal Savage throughout the first season, are you excited to wrap up this storyline and introduce a new adversary?

The show is always designed to tell these self-contained seasons. I've sort of described the show as a hybrid anthology -- it's part serialized drama, and part anthology. Each season offers a new mission or a new nemesis, and a story, with a beginning, middle and end. Season 2 will follow that road. We've been in the writers' room for a few weeks now, working on Season 2. I'm really excited about it. We've gotten a chance to look at all the things that worked on the show, gear towards that and avoid all the things that didn't work so well.

How does Patrick J. Adams' mysterious character figure into the big picture?

I can't say much in advance of the season finale. First of all, Patrick is a wonderful guy and a joy to work with. I can also say, while the finale gives you a very clear ending of Season 1, it plants some very deep flags in terms of what Season 2 is going to be. Patrick's involvement is critical to that.

Some fans believe Patrick is Earth-2's Green Lantern, Alan Scott.

I'll tell you right now, because I never want anyone to be disappointed, he's not Alan Scott. I love Alan Scott. I've written Alan Scott in the comics. Alan Scott is also attached to the Green Lantern franchise, which DC obviously has feature plans for. In the poll of "who it's going to be," you can cross off Alan Scott.

Now that the Time Council has been eliminated, does that change the rules of time travel?

It doesn't change the rule of time travel, per se. What it does do is, it eliminates who has been protecting time. We know that the Time Masters, for whatever their faults are, were protecting the timeline from being altered. The destruction of the Oculus, and the elimination of the Time Masters, has put the timeline without a protector. You'll hear in the season finale what the Legends plan for those circumstances.

The Legends were a rag-tag group recruited to end Savage's reign of terror. Assuming they accomplish that mission, what keeps them together afterward?

It will be clearly dramatized in the season finale. Rip will clearly articulate what the team's mission statement is for Season 2. The final moments will give you a pretty good sense to where we are heading.

Finally, now that "Supergirl" found a new home on the CW, how much has your mind been racing about the crossover possibilities?

Only in so far as crossing over three shows is a brutal affair. Crossing over four scares the crap out of me. That's going to be my answer.