Peter Davison is on a new journey to discover everything he can about the Doctor's Companion. What exactly is a companion's role, how do you actually become a companion, what do they have in common and how have the companions changed over the years?

Rating: 8.1

Cast:

David

Tennant

Billie

Piper

Catherine

Tate

Alex

Kingston

Jackie

Lane

Peter

Davison

Freema

Agyeman

Colin

Baker

Tom

Baker

John

Barrowman

Peter

Capaldi

Nicola

Bryant

Noel

Clarke

Gavin

Conrad

Jenna

Coleman

Janet

Fielding

Martin

Friend

Murray

Gold

Kelly

Hunter

Steven

Moffat

Andy

Pryor

Sarah

Sutton

David

Tennant

Billie

Piper

Catherine

Tate

Alex

Kingston

Jackie

Lane

Peter

Davison

Freema

Agyeman

Colin

Baker

Tom

Baker

John

Barrowman