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SAN DIEGO, CALIFORNIA - JULY 20: (L-R) Neal McDonough, Michael Malarkey, Laura Mennell and Aidan Gillen attend HISTORY's Project Blue Book SDCC Panel 2019 at Hilton San Diego Bayfront Hotel on July 20, 2019 in San Diego, California. (Photo by Joe Scarnici/Getty Images for HISTORY)

SAN DIEGO, CALIFORNIA - JULY 20: (L-R) Neal McDonough, Michael Malarkey, Laura Mennell and Aidan Gillen attend HISTORY's Project Blue Book SDCC Panel 2019 at Hilton San Diego Bayfront Hotel on July 20, 2019 in San Diego, California. (Photo by Joe Scarnici/Getty Images for HISTORY)

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SAN DIEGO, CALIFORNIA - JULY 20: (L-R) Sean Jablonski, David O'Leary, Neal McDonough, Michael Malarkey, Damian Holbrook, Laura Mennell and Aidan Gillen attend HISTORY's Project Blue Book SDCC Panel 2019 at Hilton San Diego Bayfront Hotel on July 20, 2019 in San Diego, California. (Photo by Joe Scarnici/Getty Images for HISTORY)

SAN DIEGO, CALIFORNIA - JULY 20: (L-R) Sean Jablonski, David O'Leary, Neal McDonough, Michael Malarkey, Damian Holbrook, Laura Mennell and Aidan Gillen attend HISTORY's Project Blue Book SDCC Panel 2019 at Hilton San Diego Bayfront Hotel on July 20, 2019 in San Diego, California. (Photo by Joe Scarnici/Getty Images for HISTORY)

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SAN DIEGO, CALIFORNIA - JULY 20: (L-R) Aidan Gillen, Michael Malarkey, Laura Mennell and Neal McDonough attend HISTORY's Project Blue Book SDCC Panel 2019 at Hilton San Diego Bayfront Hotel on July 20, 2019 in San Diego, California. (Photo by Joe Scarnici/Getty Images for HISTORY)

SAN DIEGO, CALIFORNIA - JULY 20: (L-R) Aidan Gillen, Michael Malarkey, Laura Mennell and Neal McDonough attend HISTORY's Project Blue Book SDCC Panel 2019 at Hilton San Diego Bayfront Hotel on July 20, 2019 in San Diego, California. (Photo by Joe Scarnici/Getty Images for HISTORY)

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SAN DIEGO, CALIFORNIA - JULY 20: (L-R) Aidan Gillen, Michael Malarkey, Laura Mennell, Neal McDonough, David O'Leary and Sean Jablonski attend HISTORY's Project Blue Book SDCC Panel 2019 at Hilton San Diego Bayfront Hotel on July 20, 2019 in San Diego, California. (Photo by Joe Scarnici/Getty Images for HISTORY)

SAN DIEGO, CALIFORNIA - JULY 20: (L-R) Aidan Gillen, Michael Malarkey, Laura Mennell, Neal McDonough, David O'Leary and Sean Jablonski attend HISTORY's Project Blue Book SDCC Panel 2019 at Hilton San Diego Bayfront Hotel on July 20, 2019 in San Diego, California. (Photo by Joe Scarnici/Getty Images for HISTORY)

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SAN DIEGO, CALIFORNIA - JULY 20: (L-R) Aidan Gillen, Michael Malarkey, Laura Mennell, Neal McDonough, David O'Leary and Sean Jablonski attend HISTORY's Project Blue Book SDCC Panel 2019 at Hilton San Diego Bayfront Hotel on July 20, 2019 in San Diego, California. (Photo by Joe Scarnici/Getty Images for HISTORY)

SAN DIEGO, CALIFORNIA - JULY 20: (L-R) Aidan Gillen, Michael Malarkey, Laura Mennell, Neal McDonough, David O'Leary and Sean Jablonski attend HISTORY's Project Blue Book SDCC Panel 2019 at Hilton San Diego Bayfront Hotel on July 20, 2019 in San Diego, California. (Photo by Joe Scarnici/Getty Images for HISTORY)