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S01E03: Square Root of Evil
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, known as the Cardinal, announces that Riordan's girlfriend is outside waiting to see him.
Genres:
Action & Adventure, Crime, Sci-Fi & Fantasy
Air Date:
Jan 21, 1961
Production:
Associated British Picture Corporation , Associated British Corporation , ABC Weekend Television
Casts:
Patrick Macnee, Linda Thorson
The Avengers
Season 1
E1
Hot Snow
E2
Brought to Book
E3
Square Root of Evil
E4
Nightmare
E5
Crescent Moon
E6
Girl on the Trapeze
E7
Diamond Cut Diamond
E8
The Radioactive Man
E9
Ashes of Roses
E10
Hunt the Man Down
E11
Please Don't Feed the Animals
E12
Dance with Death
E13
One for the Mortuary
E14
The Springers
E15
The Frighteners
E16
The Yellow Needle
E17
Death on the Slipway
E18
Double Danger
E19
Toy Trap
E20
Tunnel of Fear
E21
The Far Distant Dead
E22
Kill the King
E23
Dead of Winter
E24
The Deadly Air
E25
A Change of Bait
E26
Dragonsfield
Season 2
E1
Mr Teddy Bear
E2
Propellant 23
E3
The Decapod
E4
Bullseye
E5
Mission to Montreal
E6
The Removal Men
E7
The Mauritius Penny
E8
Death of a Great Dane
E9
The Sell-Out
E10
Death on the Rocks
E11
Traitor in Zebra
E12
The Big Thinker
E13
Death Dispatch
E14
Dead on Course
E15
Intercrime
E16
Immortal Clay
E17
Box of Tricks
E18
Warlock
E19
The Golden Eggs
E20
School for Traitors
E21
The White Dwarf
E22
The Man in the Mirror
E23
Conspiracy of Silence
E24
A Chorus of Frogs
E25
Six Hands Across a Table
E26
Killer Whale
Season 3
E1
Brief for Murder
E2
The Undertakers
E3
Man with Two Shadows
E4
The Nutshell
E5
Death of a Batman
E6
November Five
E7
The Gilded Cage
E8
Second Sight
E9
The Medicine Men
E10
The Grandeur That Was Rome
E11
The Golden Fleece
E12
Don't Look Behind You
E13
Death A La Carte
E14
Dressed to Kill
E15
The White Elephant
E16
The Little Wonders
E17
The Wringer
E18
Mandrake
E19
The Secrets Broker
E20
Trojan Horse
E21
Build a Better Mousetrap
E22
The Outside-In Man
E23
The Charmers
E24
Concerto
E25
Esprit De Corps
E26
Lobster Quadrille
Season 4
E1
The Town of No Return
E2
The Gravediggers
E3
The Cybernauts
E4
Death at Bargain Prices
E5
Castle De'ath
E6
The Master Minds
E7
The Murder Market
E8
A Surfeit of H2O
E9
The Hour that Never Was
E10
Dial a Deadly Number
E11
Man-Eater of Surrey Green
E12
Two's a Crowd
E13
Too Many Christmas Trees
E14
Silent Dust
E15
Room Without a View
E16
Small Game For Big Hunters
E17
The Girl From Auntie
E18
The Thirteenth Hole
E19
Quick-Quick Slow Death
E20
The Danger Makers
E21
A Touch of Brimstone
E22
What the Butler Saw
E23
The House That Jack Built
E24
A Sense of History
E25
How to Succeed... at Murder
E26
Honey For the Prince
Season 5
E1
From Venus With Love
E2
The Fear Merchants
E3
Escape in Time
E4
The See-Through Man
E5
The Bird Who Knew Too Much
E6
The Winged Avenger
E7
The Living Dead
E8
The Hidden Tiger
E9
The Correct Way to Kill
E10
Never, Never Say Die
E11
Epic
E12
The Superlative Seven
E13
A Funny Thing Happened on the Way to the Station
E14
Something Nasty in the Nursery
E15
The Joker
E16
Who's Who???
E17
Return of the Cybernauts
E18
Death's Door
E19
The £50,000 Breakfast
E20
Dead Man's Treasure
E21
You Have Just Been Murdered
E22
The Positive Negative Man
E23
Murdersville
E24
Mission... Highly Improbable
Season 6
E1
The Forget-Me-Knot
E2
Game
E3
Super Secret Cypher Snatch
E4
You'll Catch Your Death
E5
Split!
E6
Whoever Shot Poor George Oblique Stroke XR40
E7
False Witness
E8
All Done With Mirrors
E9
Legacy of Death
E10
Noon Doomsday
E11
Look- (stop me if you've heard this one) But There Were These Two Fellers...
E12
Have Guns- Will Haggle
E13
They Keep Killing Steed
E14
The Interrogators
E15
The Rotters
E16
Invasion of the Earthmen
E17
Killer
E18
The Morning After
E19
The Curious Case of the Countless Clues
E20
Wish You Were Here
E21
Love All
E22
Stay Tuned
E23
Take Me To Your Leader
E24
Fog
E25
Who Was That Man I Saw You with?
E26
Homicide And Old Lace
E27
Thingumajig
E28
My Wildest Dream
E29
Requiem
E30
Take-Over
E31
Pandora
E32
Get-A-Way
E33
Bizarre
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Miriam
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