Scott Jaeck Scott Jaeck is the actor who first portrayed the Kataan administrator in the fifth season episode in and the ill - fated Lieutenant Commander Cavit in the pilot episode . Born in Milwaukee , Wisconsin , Jaeck is a well known face across the television screens who appeared in over thirty television series . He started his television work with guest roles in the ' 80s , including roles in " T . J . Hooker " ( 1985 , starring William Shatner and James Darren ) , " Hotel " ( 1985 , with Jeffrey Byron ) , " Newhart " ( 1985 , with Tony Papenfuss ) , " The Twilight Zone " ( 1985 , along with John DeMita and " Voyager " co - star Tim Russ ) , " Remington Steele " ( 1985 , with Kenneth Mars , Richard McGonagle , and Nana Visitor ) , " Shadow Chasers " ( 1986 ) , and the television drama " An Early Frost " ( 1985 , with John Glover and Terry O ' Quinn ) until he was cast as Cain Garver in the daily soap " Santa Barbara " on which he appeared in 172 episodes between 1987 and 1988 and played alongside with fellow " Trek " actors Nicolas Coster , Louise Sorel , Michael Durrell , Marj Dusay , and Brian Tochi . Further appearances include guest parts in the television series " Hunter " ( 1989 , with Michael Canavan , William Frankfather , Kathryn Graf , and Christopher Michael ) , " Beauty and the Beast " ( 1989 , starring Ron Perlman and with Ellen Geer ) , " Hard Time on Planet Earth " ( 1989 , with Scott Lincoln ) , " Designing Women " ( 1989 , with Richard Cox ) , " Alien Nation " ( 1990 , starring Gary Graham , Eric Pierpoint , Michele Scarabelli , and Ron Fassler , and with Francis Guinan and James Greene ) , " Booker " ( 1990 ) , " The Wonder Years " ( 1991 ) , the crime thriller " An Innocent Man " ( 1989 , with F . Murray Abraham , Brian J . Williams , Ben Slack , Brian Brophy , and Jack R . Orend ) , the television drama " Capital News " ( 1990 , with James Avery , Daniel Roebuck , and Noble Willingham ) , the television drama " Aftermath : A Test of Love " ( 1991 , with Raye Birk , John Cothran , Jr . , Marjorie Monaghan , Jeanne Mori , and Biff Yeager ) , and the television movie " K - 9 " ( 1991 , with Ellen Albertini Dow , Larry Hankin , Gregory Wagrowski , and Nicholas Shaffer ) . He also appeared in the recurring part of Doctor Singer in four episodes of the drama series " China Beach " ( 1990 ) with Jeff Kober , Robert Picardo , Concetta Tomei , Tim Griffin , Reiner Schöne , and Geoff Meed . After his performance in " Star Trek : The Next Generation " , Jaeck had a supporting role in the action comedy " Ring of the Musketeers " ( 1992 , directed by John Paragon and with John Rhys - Davies , Corbin Bernsen , Dick Butler , Erik Cord , Christopher Doyle , Marie Marshall , Branscombe Richmond , Jim Wilkey , and Patricia Tallman ) , guest roles in episodes of " Street Justice " ( 1993 ) , " Life Goes On " ( 1993 , with Bill Smitrovich and Tina Lifford ) , and " L . A . Law " ( 1994 , starring Corbin Bernsen and Larry Drake and with Mark Chaet , Kenneth Mars , Armin Shimerman , and Kate Vernon ) , and featured parts in the television drama " Baby Brokers " ( 1994 , with Jeffrey Nordling and Catherine MacNeal ) and the television drama " Ray Alexander : A Taste for Justice " ( 1994 , with Rosalind Allen , Michael Champion , Stanley Kamel , Willie Garson , and Aaron Lustig ) . Also in this time he started two recurring parts , one as teacher Mr . Chapman in five episodes of " Beverly Hills , 90210 " ( 1991 - 1993 , along with " Trek " performers Mark Kiely , Stephanie Beacham , Ann Gillespie , and Marilyn Rockafellow ) and the other one as Doctor Steven Flint in twelve episodes of the drama series " ER " between 1994 and 2002 , with Julianna McCarthy , Michael Cavanaugh , Christine Healy , Liz Vassey , Scott Lincoln , Shelly Desai , Thomas Dekker , Miguel Ferrer , Christine Harnos , Herta Ware , Sam Anderson , Anne Haney , Brenda Strong , William Utay , Richard Herd , Christine Jansen , David Selburg , Mary Mara , Barbara Tarbuck , Steven Culp , Lily Mariye , Stephanie Erb , Wade Williams , Cress Williams , Craig Baxley , Jr . , Darwyn Carson , Rosalind Chao , Michelle Bonilla , Lawrence Monoson , Bob Minor , Gwynyth Walsh , Harry Hutchinson , and Michael Spound . Following his second " Star Trek " role , Jaeck guest starred in the television series " University Hospital " ( 1995 , with Doug Wert ) , " Renegade " ( 1996 , with Branscombe Richmond , Barry Lynch , and Cyril O ' Reilly ) , " JAG " ( 1995 and 1996 , with Bill Bolender , Cliff DeYoung , Glenn Morshower , Terry O ' Quinn , Jack Shearer , and Ned Vaughn ) , " Picket Fences " ( 1996 , with Kelly Connell , Ray Walston , and Gregg Daniel ) , " Dark Skies " ( 1996 , with Joey Aresco , Tim Kelleher , and Andrew Hawkes ) , " The Larry Sanders Show " ( 1996 , with Wallace Langham , Penny Johnson , and Scott Thompson ) , " Chicago Hope " ( 1996 and 1997 , with April Grace , Zach Duhame , Brian Reddy , Alicia Coppola , Cathy DeBuono , and Margot Rose ) , " Mad About You " ( 1997 , with Tom Hodges and Anne Ramsay ) , " Pacific Palisades " ( 1997 , with Kerrie Keane ) , " NYPD Blue " ( 1997 , along with Gordon Clapp , Sharon Lawrence , Michael Buchman Silver , Lindsey Ginter , Michael Echols , Leland Orser , and Mike Genovese ) , " Brooklyn South " ( 1997 , with James B . Sikking , Titus Welliver , Mark Kiely , Brigid Brannagh , and Bill Bolender ) , " The Pretender " ( 1998 , with Francis Guinan ) , " Seinfeld " ( 1998 , starring Jason Alexander and with Estelle Harris , Ian Abercrombie , Richard Fancy , Brian George , Teri Hatcher , Richard Herd , Phil Morris , Heidi Swedberg , Scott Klace , and Van Epperson ) , " The Bold and the Beautiful " ( 1998 ) , " Strange World " ( 1999 , with Glenn Morshower ) , " Party of Five " ( 1999 ) , and " Nash Bridges " ( 1999 , with Willie Garson ) . In addition he appeared in the television thriller " Killing Mr . Griffin " ( 1997 , with Jennifer Hammon and Katie Jane Johnston ) and in the drama " Washington Square " ( 1997 ) . In the more recent years Jaeck just had a few appearances beside his work on " ER " . He portrayed Sam Wilder in three episodes of " Charmed " ( 1999 , 2002 , and 2005 , along with Tony Todd , F . J . Rio , and Joel Swetow ) , the character " Trenchcoat " in two episodes of " Prison Break " ( 2006 , with Wade Williams , Robert Knepper , and Michelle Forbes ) , and a guitar store owner in the war drama " The Lucky Ones " ( 2008 , with Molly Hagan and Spencer Garrett ) . Beside his work on screen , Jaeck starred and co - starred in several stage plays , including " Tribute " , " Awake and Sing " , " Much Ado About Nothing " , and with star Avery Brooks in the Shakespeare Theatre Company production of " " which ran from the end of October 2007 to January 2008 . For the previous three , he earned Joseph Jefferson Award for Actor in a Supporting Role in a Play nominations .