Many thanks FoolishGirl for providing all these informations.
   
  Chris Potter
Scott Wentworth
David Carradine
Belinda Metz
Victoria Snow
Robert Lansing
Kim Chan
   
Chris Potter (Peter Caine)
 
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  Born on 23.08.60 as Christopher Jay Potter in Toronto/Ontario/Canada.
Raised at the age of five in London/Ontario.
Chris is married, has 4 children and lives again in Canada.
Originally he planned a career as a professional athletic, but early discovered his preference for acting.
He started his acting career in theatre and got his first TV role in 1990. In Germany he is known primarily as Peter Caine in KFTLC.
From season 6 on he acted as Sergeant Tom Ryan in Silk Stalkings.
He appeared as a guest star in a number of several TV-series, including:
Will and Grace: Hey la, Hey lo
Outer Limits: Stranded
Touched by an angel: Angel Anonymous

In the first season of Queer as folks he played Dr. Dave Cameron.
He acted also in several movies, but as far as I know none of them was aired on German TV.
Chris directed 3 episodes of Silk Stalkings.
He is a member of the All-Star-Hockey Team. This is a Team represented also by several well-known Hollywood-Stars. They play for charity works.
Beside acting and hockey his passion belongs to the music and he recorded a CD "Toumaline" too.

If you go to imdb you'll find an actual filmography.

   
Scott Wentworth (Kermit Griffin)
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In this case it is more difficult to find any informations.
Like Kermit he obviously likes to keep his private life secret.
Probably born in 1954 in Baltimore/Maryland.
Married/1 son
He is an actor on stage and movie, directed several spectacles and wrote two musicals, of whom one could be seen in Germany too "Enter the guardman"
The role as Kermit Griffin was written expressly for him.
He acted in several movies, at least the following were aired in Germany:
Freefall
The ice storm
The Brooklyn-Story

If you go to imdb you'll find an actual filmography.

   
David Carradine (Kwai Chang Caine)
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  Born on 08.12.36 as John Arthur Carradine.
Married. He has 3 children from several relationships.
He studied music in SF and ditto came from stage to movies.
His role on Kung Fu (1972-1975) made him rise to a film star.
He had plentiful guest appearances and made at least 170 movies. In any case too much to specify.
A master screen of at time on German TV aires movies can be found here
Several CD's, books and training videos about KungFu appeared.
He has his own star on the Hollywood Walk of Fame since 01.04.1997

If you go to imdb you'll find an actual filmography.

   
Belinda Metz (Jody Powell)
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  Born on 04.01.60 in Ontario/Canada
She is married and has one daughter.
Belinda is an actress, singer, choreograph and songwriter.
She recorded at least one single and two albums.
She made several movies, of whom I don't know if they were aired in Germany.
Guest appearence among other things:
Outer Limits "Black Box"
Tek War
Friday the 13th

If you go to imdb you'll find an actual filmography.

   
Victoria Snow (Mary Margret Skalany)
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  Unfortunately I didn't found any personal information about Victoria Snow.
She acted as a guest star on several series and played among other things in the following movies:
Buffalo Jump
Love and hate
The kissing place

Naturally this list is not complete and I don't know if one of this movies was ever aired in Germany.

If you go to imdb you'll find an actual filmography.

   
Robert Lansing (Captain Paul Blaisdell)
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  Born as Robert Howell Brown on June 5, 1928
Date of death: October 23, 1994
Cause of death: Cancer
He left his wife Anne and two children from previous marriages behind.

He had his first Broadway role in 1948 and his first feature film in 1959.
Michael Sloan wrote the Part of Paul Blaisdell expreely for his friend, who already suffered with the cancer. When the strain became too much Blaisdell character was written out at the end of the second season. He died three weeks before the episode was aired.

Filmography:
leading roles in the equalizer and KFTLC
He had many guest appearances and nearly the same number of films and movies. His latest:
After school 1989
Submarine 1989

If you go to imdb you'll find an actual filmography.

   
Kim Chan (The Ancient)
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  I do not know much about Kim Chan. Supposedly he was born 1917 in China, But the real fans of the ancient don't believe that. In 1928 he moved from China to New York.

He made numerous movies, among other things:
Fifth Element
Lethal Weapon IV (Uncle Benny)

If you go to imdb you'll find an actual filmography.