•
Jan Chappell as
Tiger Moth Captain Lisa Deranne. The heroine of the story, Lisa is hired by a group of wealthy individuals to help them pilot the solar vessel and win competitive races. Whilst she has an antagonistic relationship with most of the group, she later forms a close bond with Kurt and, along with him, is one of only two survivors at the end. Jan Chappell had previously played Cally in ''
Blake's 7'' alongside Kurt actor Brian Croucher. The role of Lisa Deranne was originally offered to
Elisabeth Sladen, but she declined citing family commitments. •
Brian Croucher as Kurt. A mysterious self-made industrialist, Kurt recognizes the Sontarans based on information he has obtained from an individual implied to be
The Doctor. Along with Captain Lisa Deranne, he survives at the end of the story and becomes the sole owner of the
Tiger Moth. Brian Croucher had played Travis 2 in ''Blake's 7'' alongside co-star Jan Chappell. •
Carole Ann Ford as Zorelle, a vain and wealthy fashion designer (although it is suggested by Mari that it is actually her sister that is the brains of the company) who also drinks too much; she is killed by the Rutan shapeshifter which later assumes her form at the conclusion of the story. Ford was best known as playing
Susan Foreman, the granddaughter of the Doctor in the original series. •
Sophie Aldred as Mari, the fiancée of Nikos; the spoilt and pampered daughter of a planetary president, she is stunned by the Sontarans and later killed by the Rutan when it invades her quarters- the Rutan form of Mari then kills Zorelle. Aldred had previously played Ace, companion to the seventh Doctor in
Doctor Who. Keith Barnfather suggested to Aldred that she take on the role of Lisa Deranne after Elisabeth Sladen dropped out, but she wanted to play a more feminine character instead after three years of playing Ace in
Doctor Who. • Rory O'Donnell as Nikos, Mari's fiancé and the son of a wealthy industrialist. In love with Mari, he is first stunned by the Sontarans and later killed by them when he attempts to overpower them with their stun ray. The Rutan later takes on his form before killing Mari. Shakedown was O'Donnell's first acting job, he later appeared in the fan production
Auton 3 before becoming a casting director. •
Michael Wisher as Robar, the ship's engineer. Robar is the first to be killed by the Rutan whilst in the engine room. Wisher had appeared in a few
Doctor Who stories in the classic series, but was best known in fandom for being the first actor to play
Davros, the creator of the
Daleks. Wisher also had appeared in a number of fan-made productions in the 1980s and 1990s, including
Wartime and
The Airzone Solution. Shakedown would be Wisher's last work as an actor as he died the following year. Terrance Dicks was reportedly not happy with Wisher's decision to play Robar with an American accent. The role of Robar was originally mooted for
Brian Miller, the husband of Elisabeth Sladen, although her withdrawal from the project meant he did not eventually get involved. • Toby Aspin as Commander Steg, the leader of the Sontaran force chasing the Rutan. Although initially antagonistic to Lisa Deranne and her crew, he sacrifices himself to destroy the Rutan and save the ship at the story's conclusion. Aspin would later appear as another Sontaran in "
Mindgame". • Tom Finnis as Lieutenant Vorn, Steg's second-in-command. Slightly dimwitted, he is killed by the Rutan. Finnis would later appear in the fan production
The Few Doctors, which Kevin Davies also directed. ==Production==