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in order filmed
See a still photo from each of these films 
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| Title | Clip | Release Year |
Production Company | Director | Character |
|---|---|---|---|---|---|
| IT'S A PLEASURE | 1945 |
RKO Radio | William A. Sieter | boy referee/Davey | |
| SWAMP FIRE | 1946 |
Paramount | William H. Pine | brother | |
| UNTAMED FRONTIER |  |
1952 |
Universal-International | Hugo Fregonese | young man in dance hall |
| FRANCIS GOES TO WEST POINT | 1952 |
Universal-International | Arthur Lubin | Corp. Thomas | |
| NO ROOM FOR THE GROOM | 1952 |
Universal-International | Douglas Sirk | soldier | |
| YANKEE BUCCANEER | 1952 |
Universal-International | Fred DeCordova | Beckett | |
| BONZO GOES TO COLLEGE | 1952 |
Universal-International | Fred DeCordova | Jack | |
| WILLIE AND JOE IN BACK AT THE FRONT | |
1952 |
Universal-International | George Sherman | soldier |
| CHIEF CRAZY HORSE | 1955 |
Universal-International | George Sherman | Lt. Colin Cartwright | |
| TO HELL AND BACK | 1955 |
Universal-International | Jesse Hibbs | Lt. Lee | |
| CULT OF THE COBRA | 1955 |
Universal-International | Francis D. Lyon | Corp. Rico Nardi | |
| ALL THAT HEAVEN ALLOWS | 1956 |
Universal-International | Douglas Sirk | Freddie Norton | |
| THE PRIVATE WAR OF MAJOR BENSON | 1955 |
Universal-International | Jerry Hopper | Young Lieutenant | |
| FRANCIS IN THE NAVY | 1955 |
Universal-International | Arthur Lubin | Lt. Anders | |
| NEVER SAY GOODBYE | 1956 |
Universal-International | Jerry Hopper | Dave Heller | |
| AWAY ALL BOATS | 1956 |
Universal-International | Joseph Pevney | talker | |
| THE SQUARE JUNGLE | 1956 |
Universal-International | Jerry Hopper | Jack Lindsay | |
| SHOWDOWN AT ABILENE | 1956 |
Universal-International | Charles Haas | Deputy Verne Ward | |
| THE TOY TIGER | 1956 |
Universal-International | Jerry Hopper | Larry Tripps | |
| FRANCIS IN THE HAUNTED HOUSE | 1956 |
Universal-International | Charles Lamont | Lt. Hopkins | |
| THE GIRL HE LEFT BEHIND | 1956 |
Warner Bros | David Butler | Capt. Genaro | |
| LAFAYETTE ESCADRILLE | 1958 |
Warner Bros | William Wellman | Duke Sinclaire | |
| HELL TO ETERNITY | 1960 |
Allied Artists | Phil Karlson | Sgt. Bill Hazen | |
| DONDI | 1960 |
Alied Artists | Albert Zugsmith | Dealey/Pvt. Wheeler | |
| RING OF FIRE | 1961 |
MGM | Andrew L. Stone | Sgt. Steve Walsh | |
| KING OF THE ROARING TWENTIES | 1961 |
Allied Artists | Jos. M. Newman | Arnold Rothstein | |
| BELLE SOMMERS | 1962 |
Columbia | Elliot Silverstein | Danny Castle | |
| TWENTY PLUS TWO | 1961 |
Allied Artists | Jos. M. Newman | Tom Adler | |
| MAN-TRAP | 1961 |
Paramount | Edmond O'Brien | Vince Biskay | |
| MY SIX LOVES | 1963 |
Paramount | Gower Champion | Martin Bliss | |
| WARNING SHOT | 1967 |
Paramount | Buzz Kulik | Sgt. Tom Valens | |
| THE GREEN BERETS | 1968 |
WB/7 Arts | John Wayne | George Beckworth | |
| THE SHOES OF THE FISHERMAN | 1968 |
MGM | Michael Anderson | George Faber | |
| WHERE IT'S AT | 1969 |
United Artists | Garson Kanin | A.C. Smith | |
| MAROONED | 1969 |
Columbia | John Sturges | Ted Dougherty | |
| GENERATION | 1969 |
Avco Embassy | George Schaefer | Jim Bolton | |
| MACHO CALLAHAN | 1970 |
Avco Embassy | Bernie Kowalski | Diego Callahan | |
| PRISONER IN THE MIDDLE | 1977 |
Worldwide | John O'Connor | Col. Anthony Stevens | |
| ONCE IS NOT ENOUGH | 1975 |
Paramount | Guy Green | Tom Colt | |
| TWO-MINUTE WARNING | 1976 |
Universal | Larry Peerce | Steve | |
| THE SWISS CONSPIRACY | 1977 |
S.J. International | Jack Arnold | David Christopher | |
| GOLDEN RENDEZVOUS | 1977 |
Herald Films Intl. | Ashley Lazarus | Charles Conway | |
| COVERT ACTION | 1978 |
21st Century | Romolo Guerrieri | Lester Horton | |
| INCHON | 1981 |
One Way Prods. | Terence Young | David Feld |
DARBY’S RANGERS (1958): many sources, including Leonard Maltin’s annual movie guide, list Janssen as being in this film. This is erroneous.
Janssen was quoted as having made 32 films during his contract player years at Universal-International (early 1950’s). In fact, he made only 18. Longtime publicist Frank Liberman thinks Janssen 'made up the number' once in an interview and it was erroneously carried over in future bios and press releases.
Janssen’s scenes were cut out of the final theatrical release version of NO ROOM FOR THE GROOM (1952).
NEVER SAY GOODBYE (1956) was also known as A TIME REMEMBERED.
SHOWDOWN AT ABILENE (1956) was shot as GUN SHY.
LAFAYETTE ESCADRILLE (1958) was shot as C'EST LA GUERRE and had a UK title of HELL BENT FOR GLORY.
KING OF THE ROARING TWENTIES (1961) was also called THE BIG BANKROLL.
BELLE SOMMERS (1962) was the theatrical release of a TV pilot called THE INSIDER.
TWENTY PLUS TWO (1961) was also known as IT STARTED IN TOKYO and NIKKI (pre-production title).
MAN-TRAP (1961) was shot under the title DEADLOCK.
WHERE IT'S AT (1969) had a pre-production title of THE SPITTING IMAGE.
GENERATION (1969) was re-released under the title A TIME FOR GIVING.
PRISONER IN THE MIDDLE (1977) had alternate titles of SABRA COMMAND, WARHEAD, AND WARHEAD OPERATION: MIDEAST.
TWO-MINUTE WARNING (1976) shot additional footage specifically for the network TV premiere. However, no new footage of Janssen was filmed.
GOLDEN RENDEZVOUS (1977) was also called NUCLEAR TERROR for its TV release.
COVERT ACTION (1978) had the alternate Italian title of SONO STATO UN AGENTE CIA and also was called SPY KILL.
Janssen was cut out of the final theatrical release version of INCHON (1981). The original edited version with Janssen aired on cable in 2000.