David Clennon David Clennon is the American actor who , in , played Doctor Crell Moset as the Medical Consultant Program Beta one in the episode . A die - hard political activist , Clennon is almost as well known for his " hands - on " approach in politics as he is for his acting roles . He was born in Waukegan , Illinois . He is best known for his Emmy Award - nominated role as Miles Drentell on the television series " thirtysomething " , a role which he reprised on " Once and Again " . Clennon later won an Emmy for his performance in an episode of " Dream On " entitled " For Peter ' s Sake " , playing the title character . Fellow " Voyager " guest actor Michael McKean also guest - starred in this episode , while fellow Cardassian performer Paul Dooley and guest star Chris Demetral were regulars on the series . Film work . Clennon made his Hollywood acting debut in the acclaimed 1973 film " The Paper Chase " . His next feature film appearance was in 1976 ' s " Bound for Glory " , which starred Ronny Cox and Gail Strickland . He subsequently co - starred in such acclaimed films as " Coming Home " ( 1978 , with Bruce French and Gwen Van Dam ) , " Go Tell the Spartans " ( 1978 , with Craig Wasson and Clyde Kusatsu ) , " Being There " ( 1979 ) , " Missing " ( 1982 , also featuring Keith Szarabajka ) , " The Thing " ( 1982 , with Joel Polis ) , " The Right Stuff " ( 1983 , with Darryl Henriques ) , " Sweet Dreams " ( 1985 ) , and " Light Sleeper " ( 1992 , with Victor Garber ) . In 1981 , he had a role in the musical comedy " Ladies and Gentlemen , the Fabulous Stains " , as did Brent Spiner . He also appeared in two films featuring his " Voyager " co - star Robert Picardo : " Star 80 " in 1983 and " Matinee " ten years later . The latter also featured Dick Miller and William Schallert . Clennon is also known for his role as windbag New York Assistant District Attorney Blanchard in the 1986 crime - comedy film " Legal Eagles " which had in the cast , Robert Curtis - Brown and fellow VOY guest star Bruce French . Clennon was more recently a part of the ensemble cast of the 2004 political comedy " Silver City " ; also among this film ' s co - stars was Miguel Ferrer . The following year , Clennon appeared as the assistant Attorney General in the policital drama " Syriana " . Also starring in this film were star Alexander Siddig , actor Christopher Plummer , and DS9 and guest actor Robert Foxworth . In addition , Clennon worked with Clifton Collins , Jr . and Rosalind Chao in the 2005 drama " Life of the Party " . In 2006 Clennon was seen in ' s acclaimed war film , " Flags of Our Fathers " , along with Neal McDonough , Len Cariou , Gordon Clapp , and James Horan . Clennon then had a role in the 2010 medical drama " Extraordinary Measures " , as did Keri Russell , Alan Ruck , and Lily Mariye . Television work . He began appearing in made - for - TV movies in the 1970s , beginning with " The Migrants " in 1974 , which co - starred Ed Lauter . He then appeared in the 1976 Charles Manson drama " Helter Skelter " , which co - starred fellow " Star Trek " alumni Marc Alaimo , Phillip Richard Allen , Bruce French , Skip Homeier , Robert Ito , Roy Jenson , Paul Kent , Jonathan Lippe , and Alan Oppenheimer . Some notable TV movie credits throughout the 1980s and 1990s include " Gideon ' s Trumpet " ( 1980 , with Richard Lineback ) , " Special Bulletin " ( 1983 , with Kenneth Tigar ) , and 1993 ' s " And the Band Played On " , the latter of which also featured Reg E . Cathey , Christopher Carroll , Thomas Kopache , Clyde Kusatsu , Dakin Matthews , Lawrence Monoson , Jeffrey Nordling , Sierra Pecheur , and Saul Rubinek . Clennon was also a part of the acclaimed TV mini - series " From Earth to the Moon " in 1998 , as were Sam Anderson , David Andrews , Ronny Cox , Brett Cullen , Robert Curtis - Brown , Ann Cusack , David Drew Gallagher , Clint Howard , Daniel Hugh Kelly , John Carroll Lynch , Dakin Matthews , Deborah May , Andy Milder , Kieran Mulroney , Holmes Osborne , Ethan Phillips , Harve Presnell , Mark Rolston , Stephen Root , and Alan Ruck . One of Clennon ' s earliest TV guest appearances was a 1977 episode of " Kojak " with the aforementioned Rosalind Chao . Clennon ' s other TV appearances range from " Barney Miller " ( starring Ron Glass and James Gregory ) , " Murder , She Wrote " ( with Katherine Moffat and William Windom ) and " Beauty and the Beast " ( starring Ron Perlman ) to " Boston Legal " ( starring William Shatner and Rene Auberjonois and guest - starring Michael Ensign and Jack Shearer ) , " The West Wing " ( with Van Epperson and Stephen Root ) , and " Scrubs " ( starring Ken Jenkins ) . Clennon was a regular on the drama series " The Agency " , along with Ronny Cox and Daniel Benzali , from 2001 through 2003 . In 2006 , he was a regular on the short - lived TNT drama " Saved " . More recently , he had a recurring role as " Carl the Watcher " on the CBS drama series " Ghost Whisperer " . Among those he worked with on the latter series were Bruce Davison , April Grace , and Mark Moses .