Guy Williams Prof. John Robinson Actor June Lockhart Maureen Robinson Actor Mark Goddard Don West Actor Marta Kristen Judy Robinson Actor Bill Mumy Will Robinson Actor Angela Cartwright Penny Robinson Actor Jonathan Harris Dr. Zachary Smith Actor Dick Tufeld Robot Actor Leonard Stone Farnum Guest Star Marcel Hillaire Phanzig Guest Star Ron Gans Creature Guest Voice John Crawford Dr. Chronos Guest Star Tommy Farrell Cyborg Guest Star Lou Wagner J-5 Guest Star Fred Krone Id Monster Guest Star Bob Foulk Cragmire Guest Star Ronald Weber Mort Guest Star Woodrow Parfrey Col. Silas Fogey Guest Star James Millhollin Willoughby the Llama Guest Star Joey Russo Young Dr. Smith Guest Star Irwin Allen Producer Peter Packer Writer Robert Hamner Writer Jackson Gillis Writer Barney Slater Writer William Welch Writer Jack Turley Writer Bob Duncan Writer Don Richardson Director Sobey Martin Director Nathan Juran Director Irving J. Moore Director Wanda Duncan Writer Ezra Stone Director Sutton Roley Director