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 Werner Klemperer Bolix Guest Star Larry Ward Ohan Guest Star Theodore Lehmann Voice of Disk Guest Star Dawson Palmer Larger hairy biped Guest Star Michael Donovan second hairy monster Guest Star Irwin Allen Producer Barney Slater Writer Harry Harris Director