Coulson's wall writing days seem to be a thing of the past on Agents of SHIELD.

Fitz To Cure Himself With Memory Machine On 'Agents Of SHIELD'? Clark Gregg Talks Future Of Engineer

Unfortunately, the Director now has a new task - finding this mysterious city. The alien blood is being really demanding this season, and actor Clarke Gregg doesn't believe solving the equation or finding the city will end its effects.

"One of the really cool sci-fi elements of this show is that whatever this is, it seems to have been around for a while, and once it gets into your system, it starts to influence your behavior," Gregg told Entertainment Weekly. "I don't know that having solved the carving element of it or figuring out the city part of it is going to completely mean that that alien tissue is done with him."

Brett Dalton Dishes On Ward's New Psychology, What's Next For Grant On 'Agents Of SHIELD'?

That doesn't mean fans will have to wait forever for answers. Season 2 is moving along at a clip, and the writers are rolling out major plot points left and right.

"I think things are ramping up," Gregg explained to Entertainment Weekly. "If there are any kind of lessons that I'm learning from reading the scripts in season two is that things that might have taken a lot of episodes to pay off in season one, they're heating up really damn quickly in season two, so I'd be surprised if we went a hell of a lot longer without seeing where we were going."

Find out more when Agents of SHIELD airs Tuesdays at 9 p.m. ET on ABC. Click the video below to see a preview for the series' next episode, "The Things We Bury."

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Marvel's Agents of S.H.I.E.L.D., Television, ABC, Marvel