Lost in Space Gallery II

Professor John Robinson was played by Guy Williams.

The leader of the expedition is Professor John Sims Robinson. Born in Lowell, Massachusetts, the youngest son of a lower income family, he overcame his economic hardships by virtue of his intelligence. John also excelled on the football field, where he was the youngest starting quarterback at his high school. Although he was offered several lucrative athletic scholarships, John kept academics as his primary focus, entering California Institute of Technology to earn a degree in Planetary Geological Sciences.
Although he earned doctorates in astrophysics and geophysics, John was nicknamed 'Professor' by his co-workers at Alpha Control due to the fact that he had taught for several years at UCLA. He was instrumental in the discovery of a habitable planet in the Alpha Centauri star system, having developed the probe that was sent to study the sun's nearest neighbor. His family volunteered and was selected to be the first of many groups of space colonists to travel to Alpha Centauri's most promising planet Gamma.
He takes his role as leader and protector of the small group very, very seriously. At times during their seemingly endless journey, he has agonized over the decision that put his family in such peril and uncertainty.

Dr. Maureen Robinson was played by June Lockhart.

Maureen Tomlinson Robinson is John's better half. Maureen was born in New York, but raised by her older sister, Coleen, in California, when her parents were killed in a plane accident. Maureen and John met and were married while both were students at the California Institute of Technology. Fiercely devoted to her husband and her children, she put her education and work on hold to devote her time to raising their three children. She earned her doctoral degree in biochemistry shortly before the launch of the Jupiter II. While seemingly submissive and mousy on their endless sojourn in space, there are moments even in the series when Maureen shows an inner fire and drive that is necessary in a space pioneer.

Oldest daughter, Judith Elana, is outgoing, vivacious and sometimes quite emotional. She wanted to pursue a career in music, dance and acting, and seriously considered remaining behind when her family left on the colonization mission, but changed her mind when she found out that Major Don West was chosen to be the pilot of the Jupiter II. She and Major West hit it off immediately, but circumstances of their hardships always seemed to keep them from getting closer than that of good friends. At the time of the launch Judy was twenty.

Judy Robinson was played by Marta Kristen.

Penny Robinson was played by Angela Cartwright.

Middle child Penny Roberta, is a precocious child, highly intelligent, intensely curious, a bit of a tomboy and very imaginative. In fact her imagination has gotten her into trouble at times when she has allowed it to run away with her. She is very friendly and outgoing, and is interested in all kinds of alien life around her. Penny is also very close to her brother.
Her outgoing personality made her very popular with her instructors and friends at Alpha Control. It also endeared her to several of the aliens the Robinsons met during their journey in space.
At the time of the Jupiter's launch, Penny was eleven years old.

William Edward, the youngest child, is extremely intelligent, considered a genius on Earth. So intelligent, in fact that he skipped several grades, but this too created problems, as his older classmates had problems relating to him. Will is also very curious, that attribute sometimes getting himself and his family in trouble when he has gone off on his own. But it is his ingenuity that has also saved the family on various occasions. His quick wit sometimes borders on the sarcastic, but he is always polite. He is completely loyal to the family's Robot, even though it once tried to kill him. He often has taken up for the nefarious Dr. Smith. At the time of the launch he was nine-years-old.

Will Robinson was played by Billy Mumy.

Major Don West was played by Mark Goddard.

Major Donald West was born in New York City, the son of an Air Force pilot. By the time he was eighteen, he had earned his pilot's license. Fascinated with the space program, Don applied to the U.S. Air Force and was accepted. Upon completion of his degree and training, he was assigned to Alpha Control's pilot training center, where his abilities earned him quick recognition and rapid promotions. His abilities also earned him the spot as the Jupiter II's pilot for the colonization mission.
Very courageous, he is also hot tempered on occasion, quick to act at times when more thought is required. There is very little love lost between him and Dr. Smith.

Dr. Zachary Smith became the reluctant stowaway when he sneaked on board the Jupiter II to sabotage the Robot and did not get off before the launch.
While a boy, he was orphaned when his parents were killed in a boating accident. He was sent to live with his aunt and uncle in Georgia. He attended Oxford, eventually earned a degree, (found later to be forged), and became involved with enemy intelligence agents. He earned a doctorate from Harvard University and immediately entered the military where he worked for sixteen years and gained a reputation as an excellent psychologist. It is believed that the stresses of his sojourn in space led to the severe behavioral changes that occurred during the first year the group was lost in the unknown reaches of space.

Dr. Zachary Smith was played by Jonathan Harris.

The Robot was played by Bob May. The voice of the Robot was supplied by Dick Tuefeld.

The B-9 environmental Robot's main directive is to protect the humans on board the Jupiter II, although Dr. Smith's tampering temporarily changed that directive at the beginning of their mission. The Robot is also responsible for checking soil and air samples, supplementing the on board computers in their tasks . Although claiming to be devoid of all emotions and humor, the Robot on occasion displays an amazing understanding of such things, often exchanging witty repartees with Dr. Smith and coming off the winner. And he is amazingly mobile, considering that he rolls on wide bodied tracks.