Suggestions by @optimistic_writer

John Leeson

as K-9 in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2003)

Tom Baker

as The Fourth Doctor in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2003)

Murray Melvin

as The Master in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2003)

Anna Hope

as Sandra Armstrong in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2003)

Richard E. Grant

as The Tenth Doctor in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2003)

Russell T Davies

as Script Editor in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2003)

David Renwick

as Executive Producer in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2003)

Bill Shapter

as Producer in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2003)

Penelope Wilton

as Jaina Armstrong in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2002)

Bill Shapter

as Producer in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2002)

Anna Hope

as Commander Sandra Armstrong in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2002)

Richard E. Grant

as The Doctor in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2002)

Russell T Davies

as Script Editor in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2002)

David Renwick

as Executive Producer in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2002)

Derek Jacobi

as The Rogue in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2001)

Kate O'Mara

as The Rani in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2001)

Caroline John

as Liz Shaw in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2001)

Katy Manning

as Jo Jones in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2001)

Elisabeth Sladen

as Sarah Jane Smith in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2001)

Julia Sawalha

as Katie Tollinger in What If Doctor Who Wasn't Axed? - The Tenth Doctor (2001)