Also Known As:
- Antihristos, o arhontas tou Skotous
- Centinela de los malditos
- Hexensabbat
- La centinela
- La sentinelle des maudits
- Ondskans redskap
- Ondskapens redskap
- Sentinel
- Ta mystiriodi eglimata
- Vartija
- Michael Winner
- Michael Winner
- Jeffrey Konvitz
- Chris Sarandon ... Michael Lerman
- Cristina Raines ... Alison Parker
- Martin Balsam ... Prof. Ruzinsky
- John Carradine ... Father Halliran
- José Ferrer ... Priest of the Brotherhood
- Ava Gardner ... Miss Logan
- Arthur Kennedy ... Monsignor Franchino
- Burgess Meredith ... Charles Chazen
- Sylvia Miles ... Gerde Engstrom
- Deborah Raffin ... Jennifer
- Eli Wallach ... Detective Gatz
- Christopher Walken ... Detective Rizzo
- Jerry Orbach ... Michael Dayton
- Beverly D'Angelo ... Sandra
- Hank Garrett ... James Brenner
- Robert Gerringer ... Hart
- Nana Visitor ... Girl at end (as Nana Tucker)
- Tom Berenger ... Man at end
- William Hickey ... Perry
- Gary Allen ... Malcolm Stinnett
- Tresa Hughes ... Rebecca Stinnett
- Kate Harrington ... Anna Clark
- Jane Hoffman ... Lilian Clotkin
- Elaine Shore ... Emma Clotkin
- Sam Gray ... Dr. Aureton
- Reid Shelton ... Priest
- Fred Stuthman ... Mr. Parker
- Lucie Lancaster ... Mary Parker
- Anthony Holland ... Party host
- Jeff Goldblum ... Jack
- Zane Lasky ... Raymond
- Mady Kaplan ... Alice Marshak (student) (as Mady Heflin)
- Diane Stilwell ... Brenner's secretary (as Diane Stillwell)
- Ron McLarty ... Real estate agent
- Richard Dreyfuss ... Man on sidewalk talking to girl in red sweater
- Joe Hamer ... Detective
- Ronald Hunter ... Assistant to Michael Dayton
- Charles Kimbrough ... Hospital doctor
- Bob Melvin ... Background scary person
- Vicki Michelle ... Girl on TV
.