Dr. John Robinson (84 episodes, 1965-1968)
Maureen Robinson (84 episodes, 1965-1968)
Major Don West (84 episodes, 1965-1968)
Judy Robinson / Duplicate Judy (84 episodes, 1965-1968)
Will Robinson (84 episodes, 1965-1968)
Penny Robinson / Princess Alpha (84 episodes, 1965-1968)
Dr. Zachary Smith / Daddy Zach / Zeno (83 episodes, 1965-1968)
Monster / Android Raddion / Angus / Bog Monster / Bubble Creature / Bush Creature / Creature / IDAK Omega 17 / Izralim / Keel / Larger Hairy Biped / Moss monster / Rubberoid / Soldier / The Cosmic Monster (5 episodes, 1965-1967)
Saticon #1 / Voices / Alien #1 (1 episode, 1966-1968)
Geoo / Little Plant Monster / Monster Fly / Troll of Niffelheim (1 episode, 1966-1968)
Verda / Nancy Pi Squared (3 episodes, 1966-1968)
Mr. Zumdish (3 episodes, 1966-1967)
Aunt Gamma / Brynhilda / Ruth Templeton (3 episodes, 1965-1968)
Alien Leader / Creature / Frog Alien (2 episodes, 1966-1967)
Alien Dictator / Gromack / Mort (1 episode, 1966-1968)
Alonzo P. Tucker / Captain Alonzo P. Tucker (2 episodes, 1966-1967)
Athena / Lorelei (2 episodes, 1966-1967)
The Keeper (2 episodes, 1966)
Farnum (2 episodes, 1967-1968)
Cragmire / Kraspo (2 episodes, 1967-1968)
Junkman / Phanzig (2 episodes, 1967-1968)
IDAK Alpha 12 / Rethso (2 episodes, 1965-1967)
Elevator Operator / Security Guard (2 episodes, 1966-1967)
Edgar / Theodore (the bully) (2 episodes, 1965-1968)
Enforcer Claudio / Gambling Machine / Little Joe (1 episode, 1966)
Security Guard / Sergeant Rogers (1 episode, 1965-1968)
Mummy / Wooden Soldier (1 episode, 1967)
Jimmy Hapgood (1 episode, 1965)
Aunt Clara Simms (1 episode, 1965)
The Boy (1 episode, 1966)
Major Domo (1 episode, 1966)
Nerim (1 episode, 1966)
The Ruler (1 episode, 1966)
Bolix (1 episode, 1966)
Sybilla (1 episode, 1966)
Thief (1 episode, 1966)
Sesmar (1 episode, 1966)
Morbus (1 episode, 1966)
Jeremiah Smith (1 episode, 1966)
Keema (1 episode, 1966)
The Space Trader (1 episode, 1966)
Myko (1 episode, 1966)
Tiabo (1 episode, 1966)
Dr. Marvello (1 episode, 1966)
Nexus (1 episode, 1966)
Arcon (1 episode, 1967)
Sagramonte (1 episode, 1967)
Mr. O. M. (1 episode, 1967)
Space Hippie (1 episode, 1967)
Zalto (1 episode, 1967)
Niolani (1 episode, 1967)
Rangah (1 episode, 1967)
Colonel Silas Fogey (1 episode, 1967)
Hamish (1 episode, 1967)
Lemnoc (1 episode, 1967)
Commander Fletcher (1 episode, 1967)
Admiral Zahrk (1 episode, 1967)
Megazor (1 episode, 1967)
Cyborg (1 episode, 1967)
Alien #764 (1 episode, 1967)
Chavo (1 episode, 1967)
Dr. Chronos (1 episode, 1968)
Creech (1 episode, 1968)
Tybo (1 episode, 1968)
Sobram (1 episode, 1968)
Bartholomew (1 episode, 1968)
Gilt Proto (1 episode, 1968)
Sheriff George Baxendale (1 episode, 1965)
Moela (1 episode, 1965)
Quano (1 episode, 1966)
Effra (1 episode, 1966)
Slave (1 episode, 1966)
Princess (1 episode, 1966)
Alien (1 episode, 1966)
Alien Leader (1 episode, 1966)
Ohan (1 episode, 1966)
Fenestra (1 episode, 1966)
Dee (1 episode, 1966)
Mechanical Man I (1 episode, 1967)
J-5 (1 episode, 1967)
Alien Girl (1 episode, 1967)
Smeek (1 episode, 1967)
Grover (1 episode, 1967)
Princess Reyka (1 episode, 1967)
Sergeant Smith (1 episode, 1967)
Thor (1 episode, 1967)
MXR (1 episode, 1967)
Urso (1 episode, 1967)
Alien #1220 (1 episode, 1967)
Fedor (1 episode, 1968)
Guard #1 (1 episode, 1968)
Warden (1 episode, 1968)
General Squires (1 episode, 1968)
Willoughby the Llama (1 episode, 1968)
Pleiades Pete (1 episode, 1966)
Handsome Alien (1 episode, 1966)
Stacy (1 episode, 1967)
Oggo (1 episode, 1967)
Mechanical Man II (1 episode, 1967)
QZW (1 episode, 1967)
Zaybo (1 episode, 1967)
Miss Teutonium (1 episode, 1968)
Newsman Lacy (1 episode, 1965)
Nubu (1 episode, 1966)
Non (1 episode, 1967)
Charlie (1 episode, 1967)
Grover (1 episode, 1965)
Craig (1 episode, 1967)
Tat (1 episode, 1967)
Phone Operator Rachel (1 episode, 1965)
First Selectman (1 episode, 1965)
Davey Sims (1 episode, 1965)
First Boy (the tall, thin blonde) (1 episode, 1965)
The Robot / Announcer / Narrator (uncredited) (84 episodes, 1965-1968)
The Robot (uncredited) (82 episodes, 1965-1968)
Debbie the Bloop (uncredited) (11 episodes, 1965-1967)
Saticon #2 / First Stone Monster / Gog - First Rock Monster / Hairy Beast / Monster #1 / Second Plant Monster / Spike Monster (uncredited) (7 episodes, 1966-1968)
Computer Eye / Purple Robot / Robot Judge / Short Alien / Zalto's Dummy (uncredited) (5 episodes, 1967)
Saticon #3 / Magog - Second Rock Monster / Second Plant Monster (uncredited) (4 episodes, 1966-1968)
Alien #2 / Alien Machine / Car Radio Announcer / Illusion Machine (uncredited) (4 episodes, 1967-1968)
Alien Monster / Chronos' Alien Assistant / Id Monster / Invisibo (uncredited) (4 episodes, 1967-1968)
Alien Soldier #2 / First Plant Monster / Mulch Pit Monster / Proto #3 (uncredited) (4 episodes, 1967-1968)
Bearded Foreign Correspondent / Computer Brain (uncredited) (3 episodes, 1965-1967)
TV Commentator (uncredited) (3 episodes, 1965)
Robotoid / Robot (uncredited) (3 episodes, 1966-1967)
Hades Monster / Hairy Monster / Second Hairy Monster (uncredited) (3 episodes, 1966)
Security Guard (uncredited) (2 episodes, 1965-1968)
Giant Bird Monster / Giant Debbie the Bloop (uncredited) (2 episodes, 1965-1966)
Mr. Nobody / Robotoid (uncredited) (2 episodes, 1965-1966)
Alien / Disk (uncredited) (2 episodes, 1965-1966)
The President (uncredited) (2 episodes, 1965)
The Giant Cyclops (uncredited) (2 episodes, 1965)
The Giant / The Giant Cyclops (uncredited) (2 episodes, 1965)
Alien on Computer Screen / Cybernetic Leader / Supreme Brain (uncredited) (2 episodes, 1966-1967)
Female Robot / Space Control Officer O-3 (uncredited) (2 episodes, 1966-1967)
Robot Guard / Robotoid (uncredited) (2 episodes, 1966-1967)
Canto of Quasti / Judge Iko (uncredited) (2 episodes, 1966)
Lighted Head Leader (uncredited) (2 episodes, 1966)
Monster #2 / Proto #2 (uncredited) (2 episodes, 1968)
Shakespeare-Reading Tape Recorder Voice (uncredited) (1 episode, 1965)
Horned Mutant (uncredited) (1 episode, 1965)
Lunon (uncredited) (1 episode, 1965)
Alpha Control Technician (uncredited) (1 episode, 1965)
General (uncredited) (1 episode, 1965)
Inspector (uncredited) (1 episode, 1965)
Luminary (uncredited) (1 episode, 1965)
Bartender (uncredited) (1 episode, 1966)
Alien Fighter (uncredited) (1 episode, 1966)
Barfly (uncredited) (1 episode, 1966)
Fat Princess (uncredited) (1 episode, 1966)
Robotoid (uncredited) (1 episode, 1966)
Barfy (uncredited) (1 episode, 1966)
Dog-faced Alien (uncredited) (1 episode, 1966)
Vicho (uncredited) (1 episode, 1966)
Smith's Double (uncredited) (1 episode, 1966)
Alien (uncredited) (1 episode, 1966)
Gundemar (uncredited) (1 episode, 1967)
Convict (uncredited) (1 episode, 1967)
The Lion (uncredited) (1 episode, 1967)
Alien Soldier #3 (uncredited) (1 episode, 1967)
Troll of Niffelheim (uncredited) (1 episode, 1967)
Deek (uncredited) (1 episode, 1967)
Young Smith (uncredited) (1 episode, 1967)
Third Alien Guard (uncredited) (1 episode, 1967)
Alien Hippie #4 (uncredited) (1 episode, 1967)
Alien Soldier #1 (uncredited) (1 episode, 1967)
Alien Soldier #4 (uncredited) (1 episode, 1967)
Fourth Alien Guard (uncredited) (1 episode, 1967)
First Alien Guard (uncredited) (1 episode, 1967)
Second Alien Guard (uncredited) (1 episode, 1967)
Mike Officer (uncredited) (1 episode, 1968)
Officer (uncredited) (1 episode, 1968)