He also did some dancing in his spare time. According to the A&E Biography, on one episode of Lost In Space, Jonathan's character, Dr. Smith, did a groovy 1960's dance with Penny and Will Robinson (Angela Cartwright and Bill Mumy).everal of Harris' one-liners from the show (such as Oh, the pain!), along with many character mannerisms, became part of the Dr. Zachary Smith character on Lost in Space. In an apparent homage to his earlier role, Harris played a similarly pompous diplomat on Get Smart in 1970. His female assistant is named Zachary.