Peter Davison

~ as ~

The Doctor

Matthew Waterhouse

~ as ~

Adric

Sarah Sutton

~ as ~

Nyssa

Janet Fielding

~ as ~

Tegan Jovanka

Anthony Ainley

~ as ~

The Master / The Portreeve

Dallas Cavell

~ as ~

Head of Security

Frank Wylie

~ as ~

Ruther

Derek Waring

~ as ~

Shardovan

Michael Sheard

~ as ~

Mergrave

Souska John

~ as ~

Child