Trivia: Supporting actor Mark Goddard first appeared onscreen in the '60s. He is now an agent.

Trivia: One of the best child actors of the 1950s and 1960s, freckled-faced Billy Mumy performed with a directness and sincerity that put many an adult performer to shame. Before he was even ten years old, Mumy had played two of the most unforgettable juveniles in TV history: malevolently telekinetic Anthony Fremont on the 1961 Twilight Zone episode "It's a Good Life," and the pistol-toting protagonist of "Bang! You're Dead," an incredibly suspenseful 1962 installment of Alfred Hitchcock Presents, directed by Hitchcock himself. In films from 1963, Mumy's finest cinematic hour-and-a-half was as Erasmus Leaf, an 8-year-old math genius with an all-consuming crush on Brigitte Bardot, in 1965's Dear Brigette. From 1965 to 1968, Mumy appeared as Will Robinson on the popular TV sci-fi fantasy series Lost in Space. As Mumy matured, he found roles harder to come by, though he was given generous screen time in the 1971 Stanley Kramer production Bless the Beasts and Children and was a regular on the 1975 TV weekly Sunshine. He kept busy in the 1980s on the sci-fi convention lecture circuit and as a scriptwriter; he also played cameo roles in remakes of "It's a Good Life" (the middle section of the 1983 Twilight Zone feature film) and "Bang! You're Dead" (one of the components of the 1985 TV revival of Alfred Hitchcock Presents). The many fans of Bill Mumy's previous work in the realm of "fantastic television" were delighted in 1995 to find him playing the recurring role of Lennier on the syndicated TVer Babylon 5.

Trivia: Charles Horvath entered films in the immediate postwar years as a stunt man. From 1951 onward, Horvath began receiving speaking roles, most often in westerns. He occasionally accepted contemporary parts, playing rednecks and toughs in such films as Damn Citizen (1957). Charles Horvath spent his last decade playing featured roles in films like A Woman Under the Influence (1974) and The Domino Principle (1977).

Trivia: Instantly recognizable for his sophisticated and grim-visaged manner of speech and his sharp, expressive features, popular character actor Jonathan Harris' villainous role on the beloved series Lost in Space earned him both a noted spot in the annals of television history and a warm place in the hearts of TV viewers everywhere. Born Jonathan Charasuchin in November 1914, the son of impoverished Russian-Jewish immigrants worked as a pharmacy box boy in his early teens, later pursuing a pharmacology degree from Fordham University. Though successful in his early career, the young pharmacist couldn't resist the lure of the stage, and after changing his surname, Jonathan Harris began making frequent appearances on the local stock company stages. Though his talent was undeniable, Harris felt that his thick New York accent impeded his ability to pursue the roles he wanted. Taking to British film as a means to remedy this, Harris took in as many British movies as possible in order to re-create their speech patterns, an ability he used to striking effect on both stage and screen -- so effective, in fact, that it became his trademark, with many of his fans failing to realize that offscreen, Harris' accent was pure "New Yorkese." Eventually drawn to the bright lights of Broadway, Harris became a fixture in the office of the Henry Miller Theater. Introduced to Gilbert Miller by Miller's sympathetic secretary, Harris' Broadway career subsequently took off following a small role in The Heart of a City. After finding a steady career on the stages of New York and on live television, Harris packed his bags for Hollywood and made his feature debut in 1953's Botany Bay. Television roles in The Twilight Zone and Bewitched followed in short succession, and in 1965 Harris received the biggest break of his career when cast in Lost in Space. Crediting producer Irwin Allen with giving him free rein regarding character interpretation, Harris quickly became the biggest draw of Lost in Space due to his unique comic villainy. Despite his co-stars' rumored aggravation over his breakout performance, Harris' utter professionalism and genuinely friendly demeanor won over cast and crew as effectively as his villainous persona did the viewing public. Also appearing in such popular television series as Zorro, Sanford and Son, and Night Gallery, Harris would frequently lend his distinct voice to numerous cartoons (Darkwing Duck, Freakazoid!) in addition to the infrequent theatrical release (A Bug's Life [1998] and Toy Story 2 [1999]). Married to high school sweetheart Gertrude in 1938, the couple's marriage endured to Harris' death in late 2002 resulting from a blood clot in his heart. He was 87.

Trivia: For most actors, scoring a memorable role means becoming a famous face, but things were trickier for Bob May, whose famous role hid him inside an unwieldy robot costume. Best known for playing The Robot on the TV series Lost in Space, May played the beloved droid while donning a large prop suit designed by Robert Kinoshita, who also created Forbidden Planet's Robby the Robot.May grew up in New York, the grandson of a vaudevillian. He got his own start in show business at just two years old, when his granddad cast him in a comedy review, and the tyke was hooked. Once he was fully grown, May edged his way into the industry by doing other actors' dirty work as a stuntman. His charm and charisma eventually began to land him more squarely in front of the camera, and he found work as an actor on TV shows like The Time Tunnel and McHale's Navy. May then snagged the role of The Robot on Lost in Space, supposedly just because he fit the constrictive suit. It was a difficult task, but May was said to have enjoyed it, staying inside even between takes to avoid the drawn out process of getting in and out, and often smoking from his cozy inner chamber, causing the 'bot to comically billow plumes of smoke from its hinges. After Lost in Space ended in 1968, May became a fixture at sci-fi conventions and fan gatherings. He lived in California with his wife Judith until his death in 2009 at the age of 69.

Trivia: Tall, balding, good-looking actor Michael Conrad came to prominence in the role of Sgt. Esterhaus on the TV series Hill Street Blues. He had many supporting roles in movies.