Eugene is known for being one of the quirkier characters, and McDermitt spoke to AMC about who inspired the character.
He said: “I definitely know people who are like Eugene; if they don’t know something, you’ll never know that they don’t know it.
“In fact, I’m hesitant to say this because it will make him upset, but I’m pretty much doing an impression of my little brother when I do Eugene.
“He’s dry, he doesn’t show any emotion, and you’re thinking, ‘Man, this guy’s an a**. Well, he’s a sweet guy, my brother.
“But he also will BS his way through anything. He convinces people he’s Russian all the time, and he went out and learned a lot of Russian to be able to speak to people so that he could back up this claim. And look, my brother and I are cut from the same cloth. So it was very easy to identify with Eugene.”