Jason Marsden Jason Christopher Marsden is an American screen and voice actor who played the role of Grimp in the episode . He previously voiced Raymond Marr in the fifth season episode in , for which he received no screen credit . Marsden was born in Providence , Rhode Island , but he moved to Fullerton , California with his parents in 1985 . As an actor , he is remembered for his roles on such popular sitcoms as " Full House " , " Boy Meets World " , and " Step By Step " . As a voice actor , he is known for playing such characters as Cavin on Disney ' s " Adventures of the Gummi Bears " , Max Goof in " A Goofy Movie " , and Chester McBadbat in " The Fairly OddParents " . Screen acting roles . Marsden started acting in 1986 , becoming the third actor to play " Alan ' A . J . ' Quartermaine , Jr . " on the soap opera " General Hospital " . He made his film debut in the 1990 science fiction feature " Robot Jox " , which also featured Jeffrey Combs . From 1988 through 1991 , Marsden starred as Eddie Munster in " The Munsters Today " . John Schuck played his on - screen father , Herman Munster , and Lee Meriwether played his mother , Lily Munster . Marsden was nominated for four Young Artist Awards for his performance on this show . Marsden also received Young Artist Award nominations for his guest appearances on the television shows " Anything But Love " and " Baywatch " . He was also nominated for his performance in the 1992 film " Mr . Saturday Night " , which starred Julie Warner and featured an appearance by Tim Russ . In 1992 , Marsden played the mysterious Dash X on the cult horror - mystery series " Eerie , Indiana " . The following year , he became a regular on the short - lived NBC comedy series " Almost Home " ( formerly known as " The Torkelsons " ) , for which he received another Young Artist Award nomination . In one episode of " Almost Home " , his character complains about missing " Deep Space Nine " to have a family dinner . During the 1994 - 1995 television season , Marsden had a recurring role on two television series : " Full House " ( as " Nelson Burkhand " ) and " Boy Meets World " ( as a character also named " Jason Marsden " ) . His work on the latter earned him his last Young Artist Award nomination and also allowed him to work with fellow " Star Trek " alumni Shay Astar , Katie Jane Johnston , Herschel Sparber , and Musetta Vander . Marsden had a supporting role in the 1996 Ridley Scott film " White Squall " , which starred John Savage . Marsden also had a supporting role in the 1997 comedy film " Tojan War " . From 1997 through 1998 , Marsden played " Rich Halke " as a regular of the sitcom " Step by Step " , having previously played the role as a recurring character between 1993 and 1996 . Since 2000 , Marsden has made guest appearances on such shows as " Ally McBeal " , " Just Shoot Me " , and " Will & Grace " . He also made two appearances on the CBS legal drama " Shark " , on which star Jeri Ryan was a regular . In addition , Marsden had roles in the TV movies " How to Make a Monster " ( with Steven Culp ) and " Return to the Batcave : The Misadventures of Adam and Burt " ( with Ray Buktenica , Christopher Darga , Frank Gorshin , Jim Jansen , the aforementioned Lee Meriwether , Todd Merrill , Julie Newmar , Julia Rose , Joel Swetow , and Steve Vinovich ) . His recent film credits have included 2005 ' s " Fun with Dick and Jane " ( in which he and Scott L . Schwartz played convenient store clerks ) and 2006 ' s " Nice Guys " ( co - starring Andy Dick ) . Voice - over roles . Marsden was the fourth actor to voice Cavin , the Human boy who befriends the Gummi Bears , in Disney ' s " Adventures of the Gummi Bears " . He voiced the character for the show ' s fourth and fifth seasons ( 1988 and 1989 , respectively ) , after which he was replaced by another " Star Trek " alumnus , R . J . Williams . Marsden , however , was the only actor to voice Cavin for more than one season . Following his work on " Gummi Bears " , Marsden voiced Peter Pan on " Peter Pan and the Pirates " , which also featured Tony Jay . For his work on this series , Marsden was nominated for a Young Artist Award in the " Outstanding Voice - Over in an Animation Series " category . He received another Young Artist Award nomination for voicing Thackery Binx ( a boy turned into a cat ) in the 1993 live - action Disney film " Hocus Pocus " . " Star Trek : Voyager " guest star Charles Rocket had an on - screen role in this film . Over the span of nine years , Marsden voiced Maximillian " Max " Goof , the teenage son of classic Disney cartoon character Goofy . The first time was in the 1995 animated Disney film " A Goofy Movie " , which also featured the voice of Wallace Shawn as Max ' s high school principal . Marsden reprised the role of Max in the 2000 direct - to - video sequel , " An Extremely Goofy Movie " ( with Bebe Neuwirth ) and subsequently played the character on the television series " House of Mouse " and in the video " Mickey ' s Twice Upon a Christmas " ( narrated by Clive Revill ) . Marsden was the voice of young Shere Khan the Tiger ( a character voiced as an adult by the aforementioned Tony Jay ) and young Prince Louie the Ape in the Disney series " Jungle Cubs " , with Pamela Segall voicing Baloo the Bear and David L . Lander and Michael McKean voicing Arthur and Cecil , a pair of vultures . Marsden ' s subsequent television voice - over roles include : Garrett Miller on " Extreme Ghostbusters " ; Jack on " Xyber 9 : Red Dawn " ( with Rene Auberjonois voicing the title character and Tony Jay voicing Machestro ) ; Mungo the ape on Disney ' s " The Legend of Tarzan " ( starring Olivia d ' Abo as the voice of Jane ) ; Tino Tonitini on Disney ' s " The Weekenders " ; Richie Foley aka Gear on " Static Shock " ; Snapper Carr on " Justice League " ; Chase Young on " Xiaolin Showdown " ; Matt Olsen aka Shagon on " W . I . T . C . H . " ; and Danger Duck on " Loonatics Unleashed " . In addition , Marsden was a voice actor in the 1998 direct - to - video release " The Lion King II : Simba ' s Pride " , the sequel to Disney ' s 1994 theatrical hit " The Lion King " . In this movie , Marsden is the voice of the adult Kovu , while former " Star Trek : Voyager " cast member Jennifer Lien voiced Kovu ' s sister , Vitani , and " Voyager " guest star Andy Dick voiced Kovu ' s brother , Nuka . Interestingly , Kovu ' s singing voice was supplied by Gene Miller , who also sang the theme song for Disney ' s " Adventures of the Gummi Bears " , which Marsden had been a part of ten years earlier . Marsden is currently the voice of Chester McBadbat on the popular Nickelodeon cartoon " The Fairly OddParents " . He took over the role from Frankie Muniz in 2003 .