Frank Welker Franklin Wendell " Frank " Welker is an American screen and veteran voice actor who has created a broad spectrum of character voices and vocal effects in Hollywood since the 1960s . For the " Star Trek " franchise , he provided Spock ' s screams in and voiced the cytoplasmic lifeform in the episode . He also did additional voice work for the video games " " , " " , and " " . Early life . Welker was born in Denver , Colorado , but attended college in California . He performed in numerous college plays and formed his own stand - up comedy act which led to him touring in concerts with performers such as The Righteous Brothers and Sergio Mendes . He later performed in areas such as Los Vegas and Lake Tahoe as the opening act for such headliners as Sonny and Cher , Diana Ross and Loretta Lynn . Voice acting career . Welker has done over 1 , 200 voices since the late 1960s , earning him the title of " voice acting god " from some of his fellow voice - over artists . One of Welker ' s earliest voice - over roles was the Pushmi - pullyu in the film " Doctor Dolittle " , which starred guest actress Samantha Eggar . One of Welker ' s most famous voice roles is that of Fred Jones in the various " Scooby - Doo " cartoons . He first played " Freddie " in the 1969 - 1972 series " Scooby - Doo , Where Are You ! " , and has continued voicing the character ever since . Since 2002 ( starting with the series " What ' s New , Scooby - Doo ? " ) , Welker has been the voice of both Freddie and Scooby - Doo . Welker is also strongly affiliated with the " Transformers " series . He provided the voice for ten of the Decepticons on the 1980s series : Megatron ( the Decepticon leader ) , Soundwave , Skywarp , Mixmaster , Laserbeak , Buzzsaw , Rumble , Frenzy , Ravage and Ratbat . He also voiced a few Autobots : Mirage , Trailbreaker , Blades , Chromedome , Groove and Sludge . In addition , he voiced Megatron , Soundwave , Rumble , Frenzy , Ravage and Laserbeak , as well as Wheelie and ( along with Michael Bell ) the Junkions , in 1986 ' s " The Transformers : The Movie " . Leonard Nimoy , with whom Welker worked on " Star Trek III " , provided the voice of Galvatron in the " Transformers " movie , Paul Eiding , who did the voice of Perceptor in " The Transformers " cartoon series also did Perceptor ' s voice in the film . Welker then took over the role of Galvatron for future productions , marking the second time he inherited a role from Nimoy , having provided the screams for Nimoy ' s character Spock in " Star Trek III " . More recently , Welker has become known for voicing Nibbler ( performing both the animalistic grunts and the rare spoken language from the character ) on the popular animated series " Futurama " . He has also voiced many animals ( including Santa ' s Little Helper ) on the long - running series " The Simpsons " . Some of the many other television characters Welker has voiced over the years include : Welker ' s vocal effects can be heard in many feature films , as well . Perhaps his most recognizable film character is that of Abu the monkey in Disney ' s " Aladdin " . He also voiced the Cave of Wonders in that film , and has since reprised the role of Abu in the film ' s direct - to - video sequels , various short films and video games , and in the mid - 1990s " Aladdin " television series . He has done voice work for many other Disney films , notably 1995 ' s " Pocahontas " as Flit the hummingbird . This film also featured the voice of John Kassir as Pocahontas ' other pet , Meeko the raccoon , as well as the voice of David Ogden Stiers . In addition , Welker and " Star Trek : The Next Generation " performers Whoopi Goldberg and Patrick Stewart voiced the books Horror , Fantasy and Adventure , respectively , in the 1994 film " The Pagemaster " . This film also featured Ed Begley , Jr . , Christopher Lloyd and the voice of Leonard Nimoy , marking Welker ' s third collaboration with Nimoy . Among the other film characters Welker has portrayed include Stripe and other creatures in the 1984 film " Gremlins " ( which starred Zach Galligan ) and Mohawk in its 1990 sequel " Gremlins 2 : The New Batch " ( whose on - screen cast included Zach Galligan , John Glover and Robert Picardo ) . He also voiced Rahzar and Tokka in the 1991 sequel " Teenage Mutant Ninja Turtles II : The Secret of the Ooze " ( which also featured the voice of Brian Tochi and on - screen performances by David Warner , Michelan Sisti , Lee Spencer and Lisa Chess ) , the Alien Sil in " Species " ( 1995 ) , Shao Kahn and Goro in " Mortal Kombat " ( 1995 ) ( starring Cary - Hiroyuki Tagawa ) , and Max the Dog in " How the Grinch Stole Christmas " ( 2000 ) . Most recently , he voiced Soundwave , Devastator , Ravage , Reedman and Grindor in the 2009 sequel " Transformers : Revenge of the Fallen " , which was co - written by Alex Kurtzman and Roberto Orci . This film also featured the voices of Robert Foxworth and Tony Todd . Welker reprised the role of Soundwave in the third film " Transformers : Dark of the Moon " , co - starring the voices of Nimoy and Keith Szarabajka . He is also a regular on the Orci and Kurtzman - produced " Transformers : Prime " - on which he reprises the role of Megatron - co - starring Jeffrey Combs . He voices Oswald the Lucky Rabbit in " Epic Mickey " and " Epic Mickey 2 : The Power of Two " . On - screen acting career . Welker made his on - screen acting debut in the Elvis Presley picture " The Trouble with Girls " ( 1969 ) , which also featured John Rubinstein and Bill Zuckert . He later appeared in the Disney films " The Computer Wore Tennis Shoes " ( 1969 ) and " Now You See Him , Now You Don ' t " ( 1972 ) , both of which were directed by Robert Butler . William Schallert had a role in former film , while William Windom starred in the latter . Welker was a regular performer on NBC ' s " The Don Knotts Show " from 1970 through 1971 . He then co - starred with that show ' s star , Don Knotts , as well as " Star Trek " alumni Yvonne Craig and the aforementioned Bill Zuckert , in the 1971 comedy film " How to Frame a Figg " . Welker then appeared in the 1972 Western film " Dirty Little Billy " , which starred Michael J . Pollard in the title role . Welker also worked with Stewart Moss in Paramount Television ' s unsold pilot for a proposed series based on Joseph Heller ' s novel " Catch - 22 " . In addition , Welker has appeared on such television series as " The Partridge Family " , " Love , American Style " , " Rowan & Martin ' s Laugh In " , " The Mike Douglas Show " , " The Dean Martin Roast " and " The Tonight Show " . In 2009 , Welker made his first on - screen acting appearance in over two decades when he played the father of Matt Damon ' s character in the serio - comic film " The Informant ! " . This film also featured star Scott Bakula , as well as Clancy Brown and Ann Cusack .