Doctor Who Five Doctors
Yes, The Five Doctors is the one that gathers together Hartnell, Troughton, Pertwee, Baker and Davison, dumps them on some moorland and lets some of the Doctor's greatest enemies take potshots at them. Except, of course, that William Hartnell had sadly passed on by the time this series was made in 1983 (although his replacement Richard Hurndall does an excellent job) and Tom Baker was only featured as a patched-in cameo, apparently prevented from joining in by a temporal thingummy.
Jon Culshaw reads this classic novelisation of Doctor Who's special 20th-anniversary TV adventure, featuring the Doctor in each of his first five incarnations. Each one has been removed from his time-stream and - with one unfortunate exception - brought to the Death Zone on Gallifrey. There, they - along with an array of their loyal former companions - encounter numerous deadly obstacles including Daleks, Cybermen, Yeti, the Master and a fiendish set of puzzles.