Torchwood (an anagram of 'Doctor Who') is a spin-off series that started in 2006 featuring the character Captain Jack Harkness who was a companion of both the ninth and tenth Doctors.

All of these are in my collection


BBC Books
Hardback

No 1 (2007)

Another Life
No 2 (2007)

Border Princes
No 3 (2007)

Slow Decay
No 4 (2008)

Something in the Water
No 5 (2008)

Trace Memory
No 6 (2008)

The Twilight Streets
No 7 (2008)

Pack Animals
No 8 (2008)

Skypoint
No 9 (2008)

Almost Perfect
No 10 (2009)

Into the Silence
No 11 (2009)

Bay of the Dead
No 12 (2009)

The House That Jack Built
No 13 (2009)

Risk Assessment
No 14 (2009)

The Undertaker's Gift
No 15 (2009)

Consequences
2012

Exodus Code

Paperback

No 16 (2011)

First Born
No 17 (2011)

Long Time Dead
No 18 (2011)

The Men Who Sold the World
2013

Exodus Code

Paperback Graphic Novel

2006

Rift War

Lulu Books

2016

Jumpin' Jack Flash