Jason Alexander Jason Alexander is a television , film , and stage actor who appeared as Kurros in the fifth season episode . His costume was later sold off on the It ' s A Wrap ! sale and auction on eBay and the trousers were later worn by background actor Patrick Barnitt . Alexander filmed his scenes for this episode on Thursday and between Monday and Friday on Paramount Stage 8 and 9 . Alexander is best known for his Emmy Award and Golden Globe - nominated role as George Costanza on the 1990s sitcom . He played the role throughout all nine seasons of the show , from 1990 through 1998 . Numerous " Star Trek " performers – including , in recurring roles , fellow " Voyager " guest star Estelle Harris as his overbearing mother , and " Voyager " guest star Richard Herd as his boss with the New York Yankees , and guest star Heidi Swedberg as his ill - fated fiancee – appeared on the show during its run , and Harris , Teri Hatcher , Brian George and Phil Morris all reprised earlier roles on the series finale . Life and career . Born Jay Scott Greenspan in Newark , New Jersey , Alexander attended that state ' s Livingston High School before departing before his senior year . It was while attending Livingston that he adopted Jason Alexander as his stage name . He then attended Boston University , but dropped out prior to his senior year after finding work in New York City . The university later awarded him with an honorary degree . Soon after beginning his acting career on New York stage , Alexander made his feature film debut in the 1981 horror movie " The Burning " . He then acquired his first steady television work when he joined the cast of the short - lived medical sitcom " E / R " , from 1984 through 1985 . He briefly became the star of his own series , " Everything ' s Relative " , in 1987 . He made infrequent appearances in film and on television throughout the 1980s , while at the same time continuing his career on the Broadway stage , including the lead role in Jerome Robbins ' " Broadway " , which garnered Alexander the 1989 Tony Award for Best Performance by a Leading Actor in a Musical . Alexander played the rotten Philip Stuckey in the hit 1990 romantic comedy " Pretty Woman " . While " Seinfeld " was on the airwaves , Alexander had roles in such films as " Jacob ' s Ladder " ( 1990 ) , " Coneheads " ( 1993 , with Michael McKean ) , ' s " The Paper " ( 1994 , co - starring Clint Howard ) , " North " ( 1994 , featuring Keone Young , Rosalind Chao , and Robert Costanzo ) , and " The Last Supper " ( 1995 , with Ron Perlman ) . He then starred in the 1996 family comedy " Dunston Checks In " ( featuring Frank Kopyc and Paula Malcomson ) and made his feature directorial debut with the film " For Better or Worse " , also released in 1996 , in which Alexander also starred along with Robert Costanzo . And , in 1997 , he starred with John Glover in " Love ! Valour ! Compassion ! " , based on the Terrence McNally play . Besides " Seinfeld " , Alexander was also nominated for an Emmy Award for his guest appearance in a 1993 episode of the HBO series " Dream On " . This episode , entitled " Oral Sex , Lies and Videotape " , also guest - starred Iman and Michael McKean . Alexander was heard as the voice of Hugo the gargoyle in Disney ' s 1996 animated film " The Hunchback of Notre Dame " , a role he reprised in the 2002 direct - to - video sequel and the cartoon series " House of Mouse " . Tony Jay , David Ogden Stiers , and Frank Welker also voiced characters in the first film . Alexander had previously voiced bungling thief Abis Mal in Disney ' s direct - to - video release of " The Return of Jafar " and , subsequently , on the " Aladdin " television series . Additionally , from 1994 through 1997 , Alexander voiced the title role in the Emmy nominated series " Duckman : Private Dick / Family Man " . He more recently supplied the voice of the evil Catbert in the short - lived , comic - strip based animated series " Dilbert " . Alexander ' s recent film credits include " The Adventures of Rocky & Bullwinkle " ( 2000 , co - starring Max Grodénchik , Norman Lloyd , Steve Rankin , and Whoopi Goldberg ) and " Shallow Hal " ( 2001 , with Bruce McGill ) . He also made appearances on such television shows as " Friends " , " Malcolm in the Middle " , and " Monk " ( with Stanley Kamel ) and starred in the short - lived sitcoms " Bob Patterson " and " Listen Up " . An admittedly avid " Star Trek " fan since childhood , Alexander is such an expert on that he passed a " Star Trek " knowledge test on the " Howard Stern " program . Alexander portrayed a parody of Captain James T . Kirk in a television special entitled " " . He went on to act with the man who originated the role of Kirk , William Shatner , in an episode of " Bob Patterson " ( on which Alexander starred in the title role ) . He also hosted " The Comedy Central Roast of William Shatner " with Andy Dick , Nichelle Nichols and George Takei on the dais to join in the roast , Clint Howard portraying and adult version of Balok and Jeri Ryan in the audience , and both have appeared in the Brad Paisley music videos " Celebrity " and " Online " . Alexander again worked with Shatner on the computer - animated film " Quantum Quest " , in which he and Shatner have voice - over roles . Also lending their voices to this project are fellow " Star Trek " alumni Robert Picardo , Chris Pine , and Brent Spiner .