
Acting
Michael Bentine CBE (born Michael James Bentin; 26 January 1922 – 26 November 1996) was a British comedian, actor and founding member of the Goons.
Description above from the Wikipedia article Michael Bentine, licensed under CC-BY-SA, full list of contributors on Wikipedia.

The Paranormal Peter Sellers
as Self (archive footage)

The Filth and the Fury
as Self (archive footage)

Spike
as Self

Alice in Wonderland
as March Hare (voice)

Rentadick
as Husein
Lights Out... and the Stars Appear
as Narrator (voice)
Bachelor of Arts
as Miklos Durti
Look at Life: Funny Business Is No Joke
as Self

The Sandwich Man
as The Sandwich Man

We Joined the Navy
as Psychologist
The Garden Party
1 ep.
Pebble Mill
as Self · 1 ep.
Daytime Live
1 ep.

Alice in Wonderland
as March Hare · 5 ep.

Six Fifty-Five Special
as Self · 1 ep.

Tell Me Another
as Himself · 1 ep.

Michael Bentine's Potty Time
72 ep.
Michael Bentine Time
as Self · 13 ep.

Great Performances
as Self · 1 ep.
Frost on Sunday
as Self – Guest · 1 ep.