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Season guide

The Avengers: Season 1

26 episodes Premiered Jan 7, 1961 Updated Jul 18, 2026

"Girl on the Trapeze," "The Frighteners," "Tunnel of Fear" and the first act of "Hot Snow" are the episodes known to exist of the first series.

Season overview

"Girl on the Trapeze," "The Frighteners," "Tunnel of Fear" and the first act of "Hot Snow" are the episodes known to exist of the first series.

Episodes

S1·E1

Hot Snow

Jan 7, 1961

Following the death of his fiancee Peggy at the hands of heroin smugglers, Dr David Keel vows to track down the killers and avenge his lost love. He is aided in his quest by a mys

S1·E2

Brought to Book

Jan 14, 1961

Steed has infiltrated a gang, led by Mason, which is implicated in Peggy's murder. Steed asks Keel to establish contact with a rival gang, and the doctor discovers that Vance's hi

S1·E3

Square Root of Evil

Jan 21, 1961

Steed impersonates Riordan, a forger soon to be released from prison, and gains the trust of gang-leader Hooper. Things seem to be going well until Hooper's second-in-command, kno

S1·E4

Nightmare

Jan 28, 1961

Keel receives a 'phone call from one of his patients, and ends up assuming the identity of her missing husband, a scientist engaged in secret research. Shot in the chest, Keel nee

S1·E5

Crescent Moon

Feb 4, 1961

A young girl, Carmelite Mendoza, has been kidnapped from a Caribbean island, but Steed suspects a political motive. His suspicions are confirmed when Vasco, the Mendoza family re

S1·E6

Girl on the Trapeze

Feb 11, 1961 · 50 min

Keel, reviving a young woman who has jumped into the Thames, is led to the Radeck State Circus, where the trapeze girl is guarded, her face covered by bandages because of an accide

S1·E7

Diamond Cut Diamond

Feb 18, 1961

Steed, attempting to break a gang of international diamond smugglers, is living in a bungalow near Heathrow Airport which was once owned by a suicide whom One-Ten suspects of invol

S1·E8

The Radioactive Man

Feb 25, 1961

Dr Keel is asked to help in the search for a man who has picked up a radioactive isotope, not knowing that it will quickly kill him and harm anyone else he comes into contact with.

S1·E9

Ashes of Roses

Mar 4, 1961

Steed, investigating a number of probable arson cases, is led to the hairdressing salon of Olive and Jacques Beronne. He asks Keel to let Carol investigate the salon, but after sh

S1·E10

Hunt the Man Down

Mar 18, 1961

Frank Preston is released from prison and is intent on reclaiming the hidden proceeds of his robbery. So is Steed, who has been ordered to follow the man. So are a couple of thug

S1·E11

Please Don't Feed the Animals

Apr 1, 1961

Steed trails a blackmailed civil servant to Brinkley House, a private zoo, only to observe the man throwing a package of money into the reptile pit. The package soon vanishes. Th

S1·E12

Dance with Death

Apr 15, 1961

Dr. Keel resuscitates Elaine Bateman, the owner of a ballroom dancing school who has narrowly survived a murder attempt by gassing. When he returns to the school after dropping hi

S1·E13

One for the Mortuary

Apr 29, 1961

When Keel attends a health conference in Geneva he is unaware that he is carrying, in microdot form, a vital new medical formula - unaware, that is, until he is arrested for murder

S1·E14

The Springers

May 13, 1961

Steed is trying to track down the organisers of a group who offer to spring any convict - even the dangerous ones - from prison if they're paid the right money. Keel impersonates

S1·E15

The Frighteners

May 27, 1961 · 51 min

To stop his daughter seeing suspected conman Jeremy de Willoughby, Sir Thomas Waller has hired arch-criminal the Deacon to 'put the frighteners on'. Steed is on the trail of the D

S1·E16

The Yellow Needle

Jun 10, 1961

After an unsuccessful murder attempt against Sir Wilberforce Lungi, Steed asks Keel, an old friend of the pro-Western African leader, to investigate Lungi's secretary, Jacquetta Br

S1·E17

Death on the Slipway

Jun 24, 1961

An agent has been killed at the secret dockyard where submarines are built. Steed investigates, and finds that a foreign spy has been arranging 'accidents' for him.

S1·E18

Double Danger

Jul 8, 1961

Keel, called to deal with a man seriously injured by an accident, quickly discovers that the man is suffering from gunshot wounds, and that he may be implicated in a recent diamon

S1·E19

Toy Trap

Jul 22, 1961

Keel is asked by the improbably named Bunty to help her find her missing friend. What is the connection between the department store where the women work and a call-girl racket?

S1·E20

Tunnel of Fear

Aug 5, 1961

Top-secret information is finding its way into the wrong hands, and the source seems to be a south coast fairground. Steed succeeds in getting hypnotised and winds up in the ghost

S1·E21

The Far Distant Dead

Aug 19, 1961

Dr Keel, treating the victims of a cyclone struck Mexican village, uncovers a number of food-poisonings; emergency cooking oil is, in fact, hydraulic fluid.

S1·E22

Kill the King

Sep 2, 1961

A visit to London to sign an oil treaty from a monarch whose life is under threat brings Steed and Keel into the world of dissidents and assassinations.

S1·E23

Dead of Winter

Dec 9, 1961

The discovery of the body of Schneider, a wanted Nazi war criminal, deep-frozen in a consignment of meat at London docks brings Steed and Keel into the shadowy world of Phoenix, a

S1·E24

The Deadly Air

Dec 16, 1961

An experimental vaccine is stolen, and the subsequent test proves deadly. Steed and Keel, suspecting that the human 'guinea pig' did not die directly from the vaccine, volunteer t

S1·E25

A Change of Bait

Dec 23, 1961

An unusual and sprawling tale of heart disease, industrial unrest, and a consignment of rotten bananas.

S1·E26

Dragonsfield

Dec 30, 1961

How has a research centre developing radiation-proof material managed to irradiate one of its scientists? Once more, Steed submits himself to scientific testing.