Doctor Who and the Nightmare of Eden

In 1980, Nightmare of Eden was released as a novelisation by Target Books under the title Doctor Who and the Nightmare of Eden.

Cover blurb
A freak accident locks two ships together in space - and a distress call brings the Doctor, Romana, and the faithful K9 onto the scene.

The Doctor's efforts to separate the two ships involve him with treacherous drug smugglers, ferocious monsters, and a savagely dangerous planet called Eden...