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Acting
Frederick was educated in Germany and France. He came to England in 1939 and took up acting at the suggestion of his English headmaster. He attended the Guildhall School of Music and Drama in London between 1946 and 1948 and started his stage career at preston Rep in 1949. Many rep seasons in provinces before West End appearances including 'The Comedy of Errors', 'Lock Up Your Daughters', 'The Potsdam Quartet', 'Big Fish, Little Fish', 'For Adults Only', 'A Patriot For Me', 'Mrs. Gibson's Boys' and 'Salad Days'. Frederick started his television career in 1955 and went into films in 1956. He continued to act in all strands of the profession until his death.

Doctor Who: The Savages
as Jano (voice)

Cold Comfort Farm
as Doctor Adolph Müdel

Selling Hitler
as Fritz Stiefel

Selling Hitler
as Fritz Stiefel

Keeping Up Appearances
as Millburn

The Chief
as Major Selwyn Davis

Indiana Jones and the Last Crusade
as World War One Ace

I Woke Up One Morning

Miss Marple: The Body in the Library
as Colonel Melchett
St. Ursula's in Danger
as Mr. Forson

Remington Steele
as Edvard Jensen

The Agatha Christie Hour
as The Count

The Kenny Everett Television Show
as Self

The Potsdam Quartet
as Douglas Smedley

Nijinsky
as Gabriel Astruc

Yes Minister

At the Fountainhead (Of German Strength)
as Kurt Langsdorf

Home-Movies
as Keith Sayle

Minder
as Inspector Klingmann

Shoestring
as Dr Neil Stirling

The Passage
as German Major (uncredited)
Der Abschlußtag
as Harry Day

Return of the Saint
as Inspector Grant

The Doombolt Chase

Winterspelt 1944
as Major Robert Wheeler

The Professionals
as Schuman

Doctor Who: The Invisible Enemy
as Professor Marius

Voyage of the Damned
as Werner Mannheim

The Seven-Per-Cent Solution
as Marker

The New Avengers
as Jones
N.U.T.S.
One-Upmanship
as Cogg-Willoughby

Doctor Who: Planet of Evil
as Sorenson

Angels
The Hanged Man
as Hans Deiter

The Sweeney
as Goldman

Churchill's People
as Caradoc

Skiboy
as Jacques Noêl

Fall of Eagles
as Holstein

Playhouse
as Keith Sayle

Warship

Scorpio
as Novins

The Protectors
as Bergen

Pretenders
as Joachim

Slaughter Day
as Klaus

Justice
as Wilkinson

The Persuaders!
as Luther

Jason King

One of Those Things
as Melchior

Song of Norway
as Henrik Ibsen
Little Women
as Professor Friedrich Bhaer
Pakbo
as Jim

Doomwatch
as Richard Massingham

The Looking Glass War
as Pilot

Department S
as Major Harwood

The Main Chance
as Peter Jarratt

The Limbo Line

The Naked Sun
as Leebig

The Inside Man
as Doctor James Austen
The Jazz Age
as Alan Cooper