The many faces of Doctor Who

As Doctor Who returns for a new online special BBC News Online takes a trip through time with the many faces of the Time Lord.

William Hartnell (centre) as the first Doctor in 1963 - with William Russell as Ian and Jacqueline Hill as Barbera

Jon Pertwee's Doctor (centre) was exiled on Earth for three years

Tom Baker was the longest serving Doctor - for seven years

The Tardis (Time and Relative Dimensions in Space) has taken the Doctor through space and time

K-9 was the fourth Doctor's loyal assistant and killed with a laser in his snout

Peter Davison swapped the green grass as a TV vet for life as the Doctor

Colin Baker - the sixth incarnation of the Time Lord - with assistant Peri

Sylvester McCoy finds time to joke with the most famous of all the Doctor's enemies, the Daleks