During a recent TV interview, Aiden Gillen and Neal McDonough expressed their own thoughts on UFOs.
The popular science-fiction series, which is airing now on 'History' (formerly 'The History Channel'), is the latest attempt to combine a TV drama with real-life events relating to the UFO phenomenon.
The actual Project Blue Book was an in-depth study of unidentified flying objects carried out by the US Air Force in the 1950s and 1960s. Its goal was to determine whether or not UFOs were a threat to the United States while also scientifically analyzing all known data about the phenomenon.
Gillen (Petyr Baelish in Game of Thrones) plays J. Allen Hynek - the astronomer and UFO researcher who originated the 'Close Encounter' UFO classification system and a scientific advisor to three US Air Force UFO studies including Project Blue Book.
McDonough, meanwhile, plays General James Harding - a high ranking government official based on real-life USAF general William Garland who was also involved in the project.
But what do the cast members of the show actually think about the possibility of alien visitation ?
"The idea of us not being the only life forms in the universe is not outrageous", Gillen said during a recent interview on Good Morning America.
"I'd like to think that at some point in our future we'd be able to make contact and probably will."
McDonough shared similar views.
"It's interesting," he said. "Being a devote Catholic, who knows what else is out there - for us to think that it's just us... I'm not so sure. But I certainly don't look at the night sky the same way any more."
"I go outside with my five kids and my wife and I look at the sky and I think... 'hmm, I wonder if...'"
You can check out the full interview below.
Season 2 of Project Blue Book is set to premiere on January 21st.