Dean Stockwell Robert Dean Stockwell , better known simply as Dean Stockwell , is the award - winning actor who portrayed the Tandaran Colonel Grat , in the first season episode . He is perhaps best known for his four - time Emmy Award - nominated role as Rear Admiral Albert " Al " Calavicci in the cult science fiction series from 1989 through 1993 , in which he co - starred with future " Enterprise " star Scott Bakula . It was his prior association with Bakula that would land him the role of Grat . Early life and career . Stockwell was born in Hollywood , California . He began acting as a child , making his film debut at the age of nine in 1945 ' s " The Valley of Decision " , co - starring guest actor John Warburton . He followed this with a supporting role in the Frank Sinatra musical film " Anchors Aweigh " that same year . He remained extremely busy throughout the 1940s and early ' 50s , with major supporting roles in such classic films as " Gentleman ' s Agreement " ( 1947 , with Jane Wyatt ) and " The Secret Garden " ( 1949 ) . Most notably , he co - starred with Errol Flynn in the 1950 adventure " Kim " , in which Stockwell played the title role . Fellow " Star Trek " alumni Arnold Moss , Michael Ansara , and Hamilton Camp also had roles in this film . Stockwell remained active in the acting business throughout his adulthood . In 1957 , at age 21 , he co - starred with Jeffrey Hunter and Stanley Adams in the Western " Gun for a Coward " . He also gave acclaimed performances in the classic films " Compulsion " ( 1959 , with ) and " Long Day ' s Journey Into Night " ( 1962 ) , winning Best Actor awards from the Cannes Film Festival for both . In 1965 , Stockwell played the recurring role of Dr . Rudy Devereux on the NBC drama series " Dr . Kildare " , working with Andrew Prine . The other television programs on which Stockwell appeared during the 1950s and 1960s include an episode of " Playhouse 90 " ( with George Takei ) , an episode of " The Twilight Zone " ( with Leonard Nimoy ) , multiple episodes of " Wagon Train " , and episodes of " Schlitz Playhouse of Stars " ( with James Gregory ) , " The Dick Powell Show " ( with Whit Bissell and Yvonne Craig ) , " The Alfred Hitchcock Hour " ( with Susan Oliver and Bert Remsen ) , " Kraft Suspense Theatre " ( with Bill Erwin ) , and " Bonanza " ( with Susan Howard and Harry Townes ) . Throughout the 1970s , Stockwell guest - starred on such television series as " Mission : Impossible " ( with Jack Donner ) , " The Streets of San Francisco " ( with Sharon Acker , William Smithers , and Tom Troupe ) , " Three for the Road " ( with Parley Baer ) , " Cannon " ( with Phillip Pine and Morgan Woodward ) , " Ellery Queen " ( with Keene Curtis and Clyde Kusatsu ) , " McCloud " ( starring Ken Lynch and Diana Muldaur ) , and " Tales of the Unexpected " ( with Robert Pine ) . He also appeared in multiple episodes of the anthology series " Police Story " , including one with William Shatner . In 1978 , Stockwell co - starred with Ted Cassidy , Jeff Corey , Ed Lauter , Julie Parrish , Nehemiah Persoff , and John Schuck in the mini - series " Greatest Heroes of the Bible " , directed by James L . Conway . Later career . Stockwell had roles in two films from director : 1984 ' s " Dune " , co - starring Brad Dourif , Virginia Madsen , and star Patrick Stewart ; and 1986 ' s " Blue Velvet " , also featuring Brad Dourif . Stockwell also appeared in two films starring Christian Slater : 1985 ' s " The Legend of Billie Jean " and 1988 ' s " Tucker : The Man and the Dream " . In addition , he had a supporting role in Paramount Pictures ' 1987 sequel " Beverly Hills Cop II " , along with Ronny Cox , who was carried over from the first film . In addition were Darryl Henriques , John Hostetter , Stephen Liska , Tommy " Tiny " Lister , Jr . and Valerie Wildman . Stockwell earned an Academy Award nomination for his performance in the supporting role of Tony " The Tiger " Russo in the 1988 comedy film " Married to the Mob " . Charles Napier and Tracey Walter had roles in this film as well . Some of his more recent film credits include " The Player " ( 1992 , with Whoopi Goldberg , Rene Auberjonois , Paul Dooley , Louise Fletcher , Sally Kellerman , Malcolm McDowell , Bert Remsen , and Ray Walston ) , " Air Force One " ( 1997 , with Bill Smitrovich , Glenn Morshower , and Boris Lee Krutonog ) , and " The Manchurian Candidate " ( 2004 , with Charles Napier , Jude Ciccolella , and Miguel Ferrer ) . On television , Stockwell guest - starred on such shows as " Hart to Hart " ( with Ray Walston ) , " The A - Team " ( starring Melinda Culea and Dwight Schultz ) , " Miami Vice " ( with Jerry Hardin and Rosanna DeSoto ) , " Murder , She Wrote " ( with Eugene Roche ) , " Burke ' s Law " ( with Joanna Cassidy ) , " Lois & Clark : The New Adventures of Superman " ( starring Teri Hatcher , K Callan , and Tracy Scoggins ) , " Chicago Hope " ( with Jeffrey Nordling ) , " Nowhere Man " ( starring Bruce Greenwood ) , " The Drew Carey Show " ( with Diedrich Bader and John Carroll Lynch ) , and " " ( with Joel Swetow ) . In 2000 , Stockwell ( along with Terri Garr , Frank Welker , and Tara Strong ) provided voice work for the animated direct - to - video movie " Batman Beyond : Return of the Joker " . He also provided his voice for the animated series " Captain Planet and the Planeteers " , which also featured the voices of LeVar Burton , Whoopi Goldberg , and Frank Welker . Stockwell played the regular villain " Duke Nukem " . In 2002 , Stockwell had a recurring role on the short - lived CBS drama " First Monday " created by " Quantum Leap " producer Donald Bellisario , starring Gail Strickland as Senator Edward Sheffield . The series was canceled but Bellisario decided to transfer the Sheffield character to " JAG " between 2002 and 2004 . On " JAG " Sheffield was elevated to Secretary of the Navy . Sheffield was promoted to replace the ousted Theodore Nelson who was portrayed by Paul Collins . During his time on the latter series , Stockwell worked with fellow " Star Trek " alumni David Andrews , Steven Culp , Chip Heller , Clyde Kusatsu , Ed Lauter , Scott Lawrence , Derek Magyar , J . Patrick McCormack , Richard McGonagle , Zoe McLellan , Christopher Neiman , Randy Oglesby , Andrew Robinson , William Sadler , Jennifer Savidge , William Windom , Ray Wise , and Jamison Yang . Stockwell and fellow " Enterprise " guest star Rick Worthy appeared on the Ronald D . Moore - produced update of " Battlestar Galactica " , each playing one of the twelve Cylon agent models . Stockwell also worked with Kate Vernon and Michelle Forbes on this series . Other " Trek " connections . Additional film and TV projects in which Stockwell appeared with other " Star Trek " performers include :