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Acting
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).

Master of Dark Shadows
as Self

Cagney & Lacey: True Convictions
as Harvey Lacey

Cagney & Lacey: The View Through the Glass Ceiling
as Harvey Lacey

Cagney & Lacey: Together Again
as Harvey Lacey

Cagney & Lacey: The Return
as Harvey Lacey

Roseanne: An Unauthorized Biography
as Jerry Barr

MacShayne: Winner Takes All
as Waldo Church

Surf Ninjas
as Mac

Without Warning: Terror in the Towers
as Jack McAllister

Mad About You
as Gus Stemple

Calendar Girl, Cop, Killer? The Bambi Bembenek Story
as John Garner

The Dark Wind
as Jake West

In a Child's Name
as Joe Silvano

Perry Mason: The Case of the Glass Coffin
as Jake Morrison

Nightmare on the 13th Floor
as Sgt. Madden

Snoops
as Sam Akers

Babycakes
as Al

The Cover Girl and the Cop
as Lieutenant Wingo

Police Story: Burnout
as Capt. Harrison
Police Story
as Capt. Harrison

Date Rape
as Joe Farrell

Daddy
as Mike Burnette

Downpayment on Murder
as Albert

Native Son
as Max

The Return of Mickey Spillane's Mike Hammer
as Chapel

Welcome Home, Bobby
as Geffin

Hostage Flight
as DiSalvo

227

Gimme an 'F'
as Bucky Berkshire

Murder, She Wrote
as Lt. Martin McGinn

Impulse
as Bob Russell

Finder of Lost Loves
as Arthur Barwell

Racing with the Moon
as Mr. Nash

Rosie: The Rosemary Clooney Story
as Uncle George

Cagney & Lacey
as Harvey Lacey

American Playhouse
as Reverend Walker

Fame

Pennies from Heaven
as The Detective

American Dream
as Coach Ritter

Hill Street Blues

The Long Days of Summer
as Duane Haley

The Last Ride of the Dalton Gang
as Charlie Powers

Trapper John, M.D.

The Return of Mod Squad
as Marty

Express to Terror
as Quinn

Supertrain
as Quinn

Vega$

Kaz

Sword of Justice
Colorado C.I.
as Kessler

Killer's Delight
as Danny

Lou Grant
as Ken Navaretti
Weekend Special

Hunter
as Power plant worker

The Hardy Boys / Nancy Drew Mysteries

Quincy, M.E.

Charlie's Angels
as Leonard Chaffey

A Small Town in Texas
as Lenny

The Kansas City Massacre
as Sam Cowley

Mobile One
as Mickey Scanlon