-Jonathan Harris, Interview: Jonathan Harris 2, William E. Anchors, Jr., The Lost In Space Encyclopedia II, (p. 348).
"Smith was despicable, desperate, selfish, cowardly, delightful, charming, awful, dreadful and marvelous. All of that I gave him. I was a lovable comic villain."
-Jonathan Harris, Starlog Magazine #248 (p.28)-
"The original Smith was a deep, dark, scowling villain and I hated him. … he was just so damn rotten."
-Jonathan Harris, Starlog Magazine #248 (p.29)-
"Smith was not originally created as a comedy character. He was just a villain, a constant threat in the first few episodes. Jonathan Harris was such a marvelous actor with great comedic overtones. He dictated what we should do with the character, and Dr. Smith became a villainous comic. We loved it. We loved it right from the beginning. Smith eventually became the show's big draw."
-Irwin Allen, Starlog Magazine #100 (p.29)-
"I don't remember who recommended Jonathan for the part, but I owe that person a dollar."
-Irwin Allen, Starlog Magazine #176 (p.59)-