Mike Genovese Michael Genovese ( sometimes credited as Mike Genovese ) is an actor who guest - starred on both and . On " The Next Generation " , he appeared as the holographic desk sergeant in the first season episode . On " Deep Space Nine " , he was Zef ' No in the second season episode . Television work . Recurring roles . Genovese has held recurring roles on the television series " Falcon Crest " , " The Flash " , and " ER " . On " Falcon Crest " , he played the role of Al Hurley and worked with fellow " Star Trek " alumni Robert Foxworth and Ellen Geer . Seven of the eight episodes in which Genovese appeared were directed either by Foxworth or by Reza Badiyi . On " The Flash " , Genovese portrayed Police Lieutenant Warren Garfield in twelve of the cult show ' s twenty - one episodes . He often worked with fellow TNG guest actor Biff Manard on the show , while others who appeared in Genovese ' s episodes include Ian Abercrombie , Jeffrey Combs , Charley Lang , Dick Miller , Bill Mumy , Robert O ' Reilly , Kenneth Tigar , and , in one episode , regular " Trek " cast members Denise Crosby and Jeri Ryan . Jim Trombetta wrote three of Genovese ' s episodes ; James A . Contner directed one . For " ER " , the long - running medical drama which airs on NBC , Genovese played Officer Al Grabarsky in twelve episodes from 1994 through 2000 . During his time on the show , he appeared in episodes with such actors as Sam Anderson , Fran Bennett , Reg E . Cathey , Keene Curtis , Kirsten Dunst , Meg Foster , Danny Goldring , Tim Halligan , Graham Jarvis , Caroline Lagerfelt , Marc Lawrence , Lily Mariye , Deborah May , Lawrence Monoson , Jeanne Mori , Robert Picardo , Tony Plana , Cristine Rose , Michael Buchman Silver , Jimmie F . Skaggs , David Spielberg , Brooke Stephens , Gabrielle Union , and Cress Williams . Guest appearances . Genovese ' s first episodic television role was an April 1983 episode of " T . J . Hooker " , which starred William Shatner in the title role and featured James Darren and Richard Herd as regulars . Hal Landon , Jr . and Biff Yeager also appeared in the episode . Genovese again appeared on " T . J . Hooker " in October that same year , in an episode directed by Winrich Kolbe . Afterward , Genovese has appeared on such television series as " Knight Rider " , " Remington Steele " , " The Dukes of Hazzard " , and " Scarecrow and Mrs . King " . Following his appearance on TNG , he guest - starred in 1989 episodes of " L . A . Law " ( working with Corbin Bernsen , Larry Drake , Anne Haney , and Tzi Ma ) and " Quantum Leap " ( starring Scott Bakula and Dean Stockwell ) . He made return visits to both of these shows in 1993 , working alongside Bernsen , Drake , and Leon Russom on " L . A . Law " and appearing in " Quantum Leap " s final episode with Bakula , Stockwell , Dan Butler , Susan Diol , Kevin McDermott , Bruce McGill , Stephen McHattie , and W . Morgan Sheppard . Genovese later appeared as Coach Westfield in two episodes of the comedy series " Family Matters " , including one with Barry Jenner . Since his DS9 appearance , Genovese has guest - starred on such television series as " Beverly Hills , 90210 " , " Chicago Hope " , " NYPD Blue " ( with Gordon Clapp , Scott Jaeck , and Leland Orser ) , " The Practice " ( in an episode with Richard McGonagle and Alan Oppenheimer ) , " JAG " ( directed by Terrence O ' Hara and co - starring Dennis Cockrum , Mark Moses , and Jennifer Savidge ) , " Cold Case " , " The Unit " ( starring Abby Brammell ) , and the short - lived " Raines " ( starring Linda Park ) . He even made a return to science fiction with an appearance on " Babylon 5 " in 1998 , working with Walter Koenig .