
John Karlen (born John Adam Karlewicz) was an American character actor who played multiple roles (Willie Loomis, Carl Collins, William H. Loomis, Desmond Collins, Alex Jenkins, and Kendrick Young) on the ABC serial Dark Shadows, in various episodes which aired from 1966 to 1971. Karlen also played Harvey Lacey, husband of Mary Beth Lacey (played by Tyne Daly), on the CBS crime series Cagney & Lacey (1982–88).

Daddy
1987 · as Mike Burnette

Racing with the Moon
1984 · as Mr. Nash

Pennies from Heaven
1981 · as The Detective

Surf Ninjas
1993 · as Mac

Impulse
1984 · as Bob Russell

The Dark Wind
1992 · as Jake West

Daughters of Darkness
1971 · as Stefan Chilton

Trilogy of Terror
1975 · as Thomas Amman

Babycakes
1989 · as Al

Night of Dark Shadows
1971 · as Alex Jenkins

Native Son
1986 · as Max

Melvin Purvis G-Man
1975 · as 'Tony' Anthony Redecci

House of Dark Shadows
1970 · as Willie Loomis

Frankenstein
1973 · as Otto Roget

Nightmare on the 13th Floor
1990 · as Sgt. Madden

American Dream
1981 · as Coach Ritter

Shirts/Skins
1973 · as Herbie Bush

Killer's Delight
1978 · as Danny