Know Your Enemy (series)

You may be looking for the feature from The Dalek World or the short story.

Know Your Enemy was a series of informational "fact files" about various enemies encountered by the Doctor. The series originated as part of the UNIT Hotline feature in early issues of Doctor Who Weekly (later Doctor Who Monthly and Doctor Who Magazine) from issue 26 through issue 47. It then returned for the celebratory issue 350.

In the 21st century, the feature was continued in a handful of revival Doctor Who annuals. Doctor Who The Official Annual 2016 renamed the series Black Archive, though the content remained the same. The original name returned in the 2021 annual.

Publication	Feature	Featured enemy
DWM 26	Know Your Enemy No.1 Dalek	Dalek
DWM 27	Know Your Enemy No.2 Ice Warrior	Ice Warrior
DWM 28	Know Your Enemy Sontaran	Sontaran
DWM 29	Know Your Enemy No.3 Voord	Voord
DWM 30	Know Your Enemy No.4 Robot K~1	K1
DWM 31	Know Your Enemy No.5 The Fish People	Fish people
DWM 32	Know Your Enemy No.6 Robots of Death	Robots of Death
DWM 33	Know Your Enemy No.7 The Cybermen	The Cybermen
DWM 34	Know Your Enemy No.8 The Spiders	The Spiders
DWM 35	Know Your Enemy No.9 The Silurians	The Silurians
DWM 36	Know Your Enemy No.10 The Ogrons	The Ogrons
DWM 37	Know Your Enemy No.11 Eldrad	Eldrad
DWM 38	Know Your Enemy No.12 The Axons	The Axons
DWM 39	Know Your Enemy No.13 The War Machine	The War Machine
DWM 40	Know Your Enemy No.14 Autons	Autons
DWM 41	Know Your Enemy No.15 Krynoids	Krynoids
DWM 42	Know Your Enemy No.15 Movellans	Movellans
DWM 43	Know Your Enemy No.16 The Master	The Master
DWM 44	Know Your Enemy No.17 The Nimon	The Nimon
DWM 45	Know Your Enemy No.18 The Mandrels	The Mandrels
DWM 46	Know Your Enemy 19 Primords	Primords
DWM 47	Know Your Enemy The Guardian	The Guardian
DWM 350	Know Your Enemy No.21 The Myrka	The Myrka
Doctor Who The Official Annual 2007	Know Your Enemy	Cassandra, Krillitane, Ood, Slitheen, Daleks, Cybermen
Doctor Who The Official Annual 2008	Know Your Enemy	Carrionites, Weeping Angels, Family of Blood, Slitheen, Judoon, Dalek Sec, Racnoss
Doctor Who The Official Annual 2009	Know Your Enemy	Max Capricorn, Sontarans, Hath, Adipose, Pyroviles, Vespiform, Davros
Doctor Who The Official Annual 2011	Know Your Enemy	Smilers, Daleks, Weeping Angels, Silurians, Vampires, Dream Lord
Doctor Who The Official Annual 2016	Black Archive	Daleks, Foretold, Boneless, Cybermen, Dream crabs, Weeping Angels
Doctor Who The Official Annual 2021	Know Your Enemy	Kasaavin, Dregs, Skithra, Reconnaissance Dalek, Judoon, Praxeus, Chagaska, Ashad, CyberMasters