The Invisible Enemy (3)

Cast

• 

  Tom Baker

  The Doctor

• 

  Louise Jameson

  Leela

• 

  John Leeson

  K9 (voice)

• 

  Michael Sheard

  Lowe

• 

  Frederick Jaeger

  Professor Marius

• Roy Herrick

  Parsons

• Elizabeth Norman

  Marius' Nurse

• 

  Jim McManus

  Opthalmologist

• Roderick Smith

  Cruikshank

• 

  Pat Gorman

  A Medic

• John Scott Martin

  Nucleus