The Avengers
Season 1, Episode 24: The Deadly Air
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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 to be the next subjects.
All Episodes - Season 1
Episode 1
Hot Snow
Episode 2
Brought to Book
Episode 3
Square Root of Evil
Episode 4
Nightmare
Episode 5
Crescent Moon
Episode 6
Girl on the Trapeze
Episode 7
Diamond Cut Diamond
Episode 8
The Radioactive Man
Episode 9
Ashes of Roses
Episode 10
Hunt the Man Down
Episode 11
Please Don't Feed the Animals
Episode 12
Dance with Death
Episode 13
One for the Mortuary
Episode 14
The Springers
Episode 15
The Frighteners
Episode 16
The Yellow Needle
Episode 17
Death on the Slipway
Episode 18
Double Danger
Episode 19
Toy Trap
Episode 20
Tunnel of Fear
Episode 21
The Far Distant Dead
Episode 22
Kill the King
Episode 23
Dead of Winter
Episode 24
The Deadly Air
Episode 25
A Change of Bait
Episode 26
Dragonsfield