Brian Bonsall Brian Eric Bonsall is one of several actors who played Alexander Rozhenko , son of Worf , in seven episodes of . Jon Steuer played the toddler Alexander in his first appearance , in the episode . When the producers decided to make Alexander a recurring character , they realized that an older child actor would be required to fulfill the demands of regular filming . Bonsall had extensive television experience , having played the youngest Keaton child , Andy , on the sitcom " Family Ties " from 1986 through 1989 . Bonsall filmed his first " Trek " episode , " New Ground " , on Tuesday and between Thursday and Wednesday on Paramount Stage 9 and 16 . For " Ethics " , he filmed his scenes on Thursday and between Monday and Thursday on Paramount Stage 8 , 9 , and 16 . For " Cost of Living " , he filmed his scenes between Tuesday and Thursday on Paramount Stage 8 , 9 , and 16 . For his brief appearance in the episode " Imaginary Friend " , Bonsall filmed his scenes on Monday on Paramount Stage 9 . Bonsall won three Young Artist Awards for his role on " Family Ties " . After " Family Ties " ended in 1989 , Bonsall starred in the made - for - television movie " Do You Know the Muffin Man " ( co - starring Graham Jarvis ) , for which he earned a Young Artist Award nomination . He went on to participate in many more television movies and specials , including " Mother Goose Rock ' n ' Rhyme " ( 1990 , with Teri Garr and Ben Vereen ) , " Angel of Death " ( 1990 , with John de Lancie and Ray Walston ) , and " False Arrest " ( 1991 , with Dennis Christopher , George Hearn , and Jeremy Roberts ) . In 1994 he starred opposite Bob Saget in the family television movie " Father and Scout " , which co - starred Heidi Swedberg and David Graf . He also made guest appearances on such television shows as " The Young Riders " ( starring Anthony Zerbe ) and " Shades of L . A . " ( starring Kenneth Mars ) . He began appearing on " Star Trek : The Next Generation " in 1991 , appearing semi - regularly during the show ' s fifth , sixth , and seventh seasons . In addition to his television work , Bonsall starred in several feature films . He played the title role in the 1992 horror thriller " Mikey " , about a demonic young boy who terrorizes his adoptive parents . This was followed with a supporting role in the 1993 thriller " Distant Cousins " , co - starring guest star Mary Crosby . That same year , Bonsall co - starred in the comedy " Father Hood " , also featuring Adrienne Barbeau and Bob Gunton . Bonsall then starred in the 1994 Disney film " Blank Check " , about a youth who comes into the possession of a blank check , which he fills out for $ 1 million . Miguel Ferrer also starred in this latter film , playing the criminal who unwittingly gives Bonsall the blank check . After starring in the 1994 television movie " Lily in Winter " ( with Salli Elise Richardson ) , Bonsall left acting for music . In 1998 , he formed a band with his friends , called Late Bloomers , and was most recently a member of the punk rock band Thruster . He has stated that he has no interest in returning to acting . Since leaving the screen , however , Bonsall has had several run - ins with the law . In 2001 , he was convicted of driving under the influence , and in 2004 , he was arrested under suspicion of drunk driving . On 28 March 2007 , Bonsall , who lives in Colorado , was arrested for charges of second - degree assault and false imprisonment after an altercation with his girlfriend . In a plea agreement , Bonsall pled guilty to third - degree assault and the other charges were dropped . He was then sentenced to 24 months ' probation on 31 August 2007 . In June 2008 , Bonsall was accused of violating the conditions of his probation by failing to pay for domestic violence classes , missing daily Breathalyzer tests , failing one Breathalyzer test , and walking out on a urine test . He was due to appear in a court hearing scheduled for 16 July 2008 to answer for these alleged probation violations . Bonsall failed to show at the hearing , however , and authorities issued an arrest warrant for the former actor , coupled with a $ 2 , 500 bond . On 5 December 2009 , Bonsall was arrested in Boulder , Colorado , for allegedly assaulting his friend with a bar stool . Bonsall has since been sentenced to two years probation .