'Live long and prosper': Zachary Quinto's unlikely 'Star Trek' connection to his great-grandfather

Actor Zachary Quinto was stunned to discover the trekkie connection he has to his maternal great-grandfather, P.J. McArdle, on the season finale of Who Do You Think You Are? Sunday.

During this week's new episode, Quinto decided to boldly go where no Quinto-man has gone before, as he went on a journey to discover his ancestral history. And while he knew his great-grandfather McArdle held some sort of political position, due to the fact that the P.J. McArdle Roadway in Pittsburgh, Pennsylvania is named after him, he didn't know too much beyond that.

Quinto learned that McArdle was a corresponding member of the "Official Organ of the Amalgamated Association of Iron, Steel and Tin Workers," who wrote letters in a journal once a month. In one of those letters, McArdle finished his message by writing, "May it live long and prosper."

The actor first gained recognition for his role as Sylar in the science fiction drama series Heroes, but he is best known for his role as Spock in the revival Star Trek films produced by J.J. Abrams. And as many trekkies know, "Live long and prosper" is the iconic Spock phrase, as it is the greeting of the Vulcan people. So you could imagine how surprised Quinto was to read that iconic phrase written by his great-grandfather over a century prior.

Quinto exclaimed, "Whoa, what? That's crazy! That's insane!" However, it wasn't highly illogical that that phrase would have been used in the year 1899, as Historian Edward S. Slavishak explained, "That line was a famous line from a stage play of Rip Van Winkle. So P.J. likely either saw the stage play or, even more likely, it was something he heard from his fellow workers. This was as close as you get as a catchphrase."

In the end, Quinto was shocked as he shared, "Wow, that is mind-blowing to me. But the fact that, I mean, 112 years before I would get the role of Spock, my great-grandfather put that phrase in a letter. What are the chances of that? Amazing. Wow, okay."

Video Transcript

[AUDIO LOGO]

ZACHARY QUINTO: Enclose a list of subscribers from the mill "may it live long and prosper." Woah, what? That's crazy. That's insane.

KYLIE MAR: On the season finale of "Who Do You Think You Are?" Sunday, actor Zachary Quinto was stunned to discover the Trekkie connection he has to his maternal great grandfather.

ZACHARY QUINTO: Wow. That is mind-blowing to me. But the fact that I mean, 112 years before I would get the role of Spock, my great grandfather put that phrase in a letter. What are the chances of that? Amazing. Wow. OK.

KYLIE MAR: Quinto first gained recognition for his role in the sci-fi Drama Series "Heroes," but he is best known for his role as Spock in the revival "Star Trek" films produced by J.J. Abrams. So you could imagine how surprised he was to read the iconic phrase written by his great grandfather over a century prior. And it turns out it wasn't highly illogical.

- That line was a famous line from a stage play of "Rip Van Winkle." So P.J, likely either saw the stage play, or even more likely, it was something he heard from his fellow workers. This was as close as he gets this catchphrase.