Tom Baker’s fourth season as the Doctor, in which the Time Lord and Leela battled a  shape changer, a deadly virus, an undying skull, tax collectors, a mad oracle and Sontarans, has been released by BBC Studios as a Blu-ray box set in limited-edition packaging.

The Collection: Season 15 includes all six adventures from the 1977-78 season – Horror of Fang Rock, The Invisible Enemy, Image of the Fendahl, The Sun Makers, Underworld and The Invasion of Time.

Alongside the remastered episodes, the box set also includes extensive special features, including documentaries, interviews, audio commentaries, optional CGI effects, PDF documents and more.

The Collection: Season 15 is out now, RRP £54.99. We have FIVE copies to give away to lucky readers.

TERMS AND CONDITIONS: The competitions open on Thursday 28 March to Wednesday 24 April. One entry per person. The competitions are not open to employees of DOCTOR WHO MAGAZINE or anyone else connected with DWM, the printers or their families. Winners will be the first correct entries drawn after the closing date. No purchase necessary. DWM will not enter into any correspondence. Winners’ names and county of residence will be available on Entrants under 16 years of age must have parental permission to enter. To read the BBC’s code of conduct for competitions and voting visit Prizes will be sent to winners as soon as possible.