Molly Parker as Maureen Robinson, a fearless and brilliant aerospace engineer taking her family on the mission to colonize Alpha Centauri for a new life on a better world. She is a mission commander. She is married to John Robinson and is the mother of three children. Toby Stephens as John Robinson, a former U.S. Navy SEAL, and husband to Maureen. He is the biological father of Maureen 's two youngest children. Maxwell Jenkins as Will Robinson, the 11 - year - old son and youngest child of Maureen and John Robinson. Taylor Russell as Judy Robinson, Maureen 's 18 - year - old biracial daughter and eldest child. She is a mission doctor, having received accelerated medical training. Mina Sundwall as Penny Robinson, the 15 - year old daughter and middle Robinson child. Ignacio Serricchio as Don West, a mechanic who also smuggles luxury goods. He has a chicken named Debbie, which he claims to be lucky. Parker Posey as Dr. Smith. She is a criminal and a sociopath who uses other people 's identities to claim their belongings. Dr. Smith, whose real name is June Harris, stole her sister Jessica 's identity and place on the colony ship. There she impersonates a Dr. Zachary Smith, to take his seat on an evacuating Jupiter ship. After landing on the planet, Dr. Smith attempts to sabotage the Jupiters ' chances of being rescued by the Resolute while manipulating and gaslighting the survivors to avoid prosecution for her crimes. The theft of the doctor 's identity is a reference to the corresponding Dr. Smith character of the original TV series. Brian Steele as the Robot, an alien mechanoid being that Will encounters on the planet that his family crash lands on. The robot has a different form from the ones on the previous series and movie.
who stars in the new netflix lost in space
Molly Parker as Maureen Robinson Toby Stephens as John Robinson Maxwell Jenkins as Will Robinson Taylor Russell as Judy Robinson Mina Sundwall as Penny Robinson Ignacio Serricchio as Don West Parker Posey as Dr. Smith