Beachhead
Episode: 1x01 | Airdate: Jan 10, 1967
David Vincent pulls his car over to take a nap late one night only to be awoken by a spaceship landing nearby. However, he struggles to convince anyone of his story.
Season 1
The Experiment
Episode: 1x02 | Airdate: Jan 17, 1967
The Mutation
Episode: 1x03 | Airdate: Jan 24, 1967
The Leeches
Episode: 1x04 | Airdate: Jan 31, 1967
Genesis
Episode: 1x05 | Airdate: Feb 7, 1967
When a cop witnesses one of the alien invaders he becomes catatonic and Vincent must try to thwart the Invaders' attempts to silence him for good.
Vikor
Episode: 1x06 | Airdate: Feb 14, 1967
When a 'man' is spotted glowing in a transparent tube, the story makes the papers leading Vincent to discover a corporation has made a deal with the Invaders.
Nightmare
Episode: 1x07 | Airdate: Feb 21, 1967
When a schoolteacher discovers an usual device she is inexplicably attacked by locusts, and when Vincent investigates he encounters unusual resistance in a small town.
Doomsday Minus One
Episode: 1x08 | Airdate: Feb 28, 1967
Vincent is summoned to an army base where he uncovers a conspiracy concerning an Invader plot to hijack a nuclear weapon test and kill millions of innocents.
Quantity: Unknown
Episode: 1x09 | Airdate: Mar 7, 1967
David tries to unravel the mystery of a metal cylinder found at the site of a plane crash.
The Innocent
Episode: 1x10 | Airdate: Mar 14, 1967
David and the invaders pursue a fisherman who found an alien weapon---proof of an invasion from outer space.
The Ivy Curtain
Episode: 1x11 | Airdate: Mar 21, 1967
David tries to shut down the aliens' indoctrination school with the help of a hard-luck pilot, who has sold out to the invaders.
The Betrayed
Episode: 1x12 | Airdate: Mar 28, 1967
David Vincent steals a computer tape in order to expose alien activity on Houston oil fields.
Storm
Episode: 1x13 | Airdate: Apr 4, 1967
David tries to convince a priest that aliens are responsible for unseasonable hurricanes and the death of the cleric's friend.
Panic
Episode: 1x14 | Airdate: Apr 11, 1967
Moonshot
Episode: 1x15 | Airdate: Apr 18, 1967
Wall of Crystal
Episode: 1x16 | Airdate: May 2, 1967
The Condemned
Episode: 1x17 | Airdate: May 9, 1967
Season 2
Condition: Red
Episode: 2x01 | Airdate: Sep 5, 1967
When a woman who was found dead after she fell from a horse miraculously turns up alive and the man who discovered her corpse disappears, Vincent investigates.
The Saucer
Episode: 2x02 | Airdate: Sep 12, 1967
The Watchers
Episode: 2x03 | Airdate: Sep 19, 1967
Valley of the Shadow
Episode: 2x04 | Airdate: Sep 26, 1967
The Enemy
Episode: 2x05 | Airdate: Oct 3, 1967
The Trial
Episode: 2x06 | Airdate: Oct 10, 1967
The Spores
Episode: 2x07 | Airdate: Oct 17, 1967
Dark Outpost
Episode: 2x08 | Airdate: Oct 24, 1967
Summit Meeting (1)
Episode: 2x09 | Airdate: Oct 31, 1967
Summit Meeting (2)
Episode: 2x10 | Airdate: Nov 7, 1967
The Prophet
Episode: 2x11 | Airdate: Nov 14, 1967
Labyrinth
Episode: 2x12 | Airdate: Nov 21, 1967
The Captive
Episode: 2x13 | Airdate: Nov 28, 1967
The Believers
Episode: 2x14 | Airdate: Dec 5, 1967
The Ransom
Episode: 2x15 | Airdate: Dec 12, 1967
Task Force
Episode: 2x16 | Airdate: Dec 26, 1967
The Possessed
Episode: 2x17 | Airdate: Jan 2, 1968
Counter-attack
Episode: 2x18 | Airdate: Jan 9, 1968
The Pit
Episode: 2x19 | Airdate: Jan 16, 1968
A vicious dog convinces Vincent aliens are responsible for a friend's recent institutionalization for insanity.
The Organization
Episode: 2x20 | Airdate: Jan 30, 1968
Vincent learns crime syndicate members are searching for extraterrestrials to recover a shipment of stolen narcotics.
The Peacemaker
Episode: 2x21 | Airdate: Feb 6, 1968
A high-ranking general asks Vincent to arrange a meeting with alien leaders to discuss peaceful coexistence.
The Vise
Episode: 2x22 | Airdate: Feb 20, 1968
Vincent has only 24 hours to prove a man recommended for appointment to an important post in the space program is an alien.
The Miracle
Episode: 2x23 | Airdate: Feb 27, 1968
Witnessing an alien incineration at a religious shrine, a young woman believes she had a miraculous vision.
The Life Seekers
Episode: 2x24 | Airdate: Mar 5, 1968
Two alien fugitives contact Vincent to ask for his help in stopping the invasion of Earth.
The Pursued
Episode: 2x25 | Airdate: Mar 19, 1968
An alien woman arranges to meet Vincent to discuss the possibility of defecting and supplying information, however, fellow invaders are in pursuit determined to silence her...
Inquisition
Episode: 2x26 | Airdate: Mar 26, 1968
Vincent is accused of murder after an explosion kills a senator seconds after he delivered a warning about an alien's presence.