"Jon Pertwee's complete fourth season as The Doctor in Doctor Who is coming to Blu-ray in this brand new collection! In 1973, Doctor Who celebrated its tenth anniversary with a very special story reuniting the first two Doctors - William Hartnell and Patrick Troughton - with Jon Pertwee's then-current Doctor. The Three Doctors kicks off an explosive, colorful series of adventures across all of time and space as the Doctor and Jo Grant (Katy Manning) encounter the rogue Time Lord Omega, the terrifying Drashigs, the noble Draconians, fearsome Ogrons, deadly Daleks and slithering giant maggots. This season also includes the final appearance of Roger Delgado as the Doctor's arch nemesis The Master, plus adventures alongside Brigadier Lethbridge-Stewart (Nicholas Courtney) and UNIT."