Guilherme Briggs Guilherme Briggs ( b . 1970 ) is a Brazil lian voice actor , dubbing director , announcer , and translator who has been heard in several Muppet / Creature Shop dubs , heard at one time or another as Sam the Eagle , Bubba the Rat , and the Swedish Chef , among others . He also dubbed Valentine in the Jim Henson Company feature " MirrorMask " . In 2011 , he directed Brazilian / Portuguese dub of " The Muppets " , also voicing Miss Piggy , Fozzie Bear , Sam the Eagle and Hobo Joe . Guilherme Briggs began his voice - over career in 1991 ( 20 years on December / 2011 ) and has become one of the most prolific Brazilian dubbers , often cast in heroic or comedic leading roles , particularly in animation . His voice was heard as Superman in " Lois & Clark " , " Justice League " / " Justice League Unlimited " , and several direct - to - dvd features ; Optimus Prime in three different " Transformers " animated series and the live - action movies ; and Harrison Ford in the redubs of the respective original " Indiana Jones " and " Star Wars " trilogies . He regularly dubs Brendan Fraser , Denzel Washington , Owen Wilson , Jim Carrey , Dwayne " The Rock " Johnson , as well as Dick Van Dyke in " Mary Poppins " , Julian McMahon in the " Fantastic Four " movies and Nip / Tuck series , and Zachary Quinto as Spock in " Star Trek " . On TV , he dubbed Josh Holloway ( Sawyer ) on " Lost " , and David Schwimmer ( Ross ) on " Friends " . In animation , he voiced Buzz Lightyear in the " Toy Story " movies , " Freakazoid " , Cosmo in " The Fairly OddParents " , Dagget in Angry Beavers , Master Yoda in Star Wars : The Clone Wars , Marvin the Martian and Pepe LePew in various Looney Tunes projects , Mickey Mouse in " Mickey Mouse Club House , specials and shows " , " Samurai Jack " , King Julien in " Madagascar " and " Madagascar Escape 2 Africa " , Ramon in " Happy Feet " and " Happy Feet Two " , Kronk in " The Emperor ' s New Groove " and " Kronk ' s New Groove " ( as well as the spinoff television series " The Emperor ' s New School " ) , Dimitri in " Anastasia " , Captain Hank Murphy in " Sealab 2021 " , Otis in " Barnyard " , Nigel in " Rio " , Eduardo in " Foster ' s Home for Imaginary Friends " , Spike Spiegel in " Cowboy Bebop : The Movie " , I . R . Baboon in " I Am Weasel " , the Minions in " Despicable Me " , Him in " The Powerpuff Girls " , the title character in the live action film " Yogi Bear " , Tulio in " The Road to El Dorado " and Moses in " The Prince of Egypt " . He is one of the official announcers of Cartoon Network in Brazil since 1994 . He directed many projects , since 2003 : " Sin City " , " Mulan 2 " , " The Ant Bully " , " The Monster House " , " Watchmen " , the " Transformers " film series , " Star Trek " ( 2009 ) , " Robin Hood " , " Seven Pounds " , " Despicable Me " , " Hollywoodland " , " Barnyard " , " Surf ' s Up " , " Open Season " , " G . I . Joe : The Rise of Cobra " , " Zathura " , the " Iron Man " film series , " A Night at the Museum 1 " and " 2 " , " Star Wars : The Clone Wars " , " Cowboys and Aliens " , " Rio " , " Hop " , " Salt " , " The Wolf Man " , " The Simpsons Movie " , " Tron Legacy " , " Avatar " , and " Mission : Impossible – Ghost Protocol " . He translated to Portuguese the first 3 Star Wars episodes : " The Phantom Menace " , " Attack of the Clones " , and " Revenge of the Sith " , the first animated series of " Star Wars : The Clone Wars " and many projects , trailers and promos for Walt Disney , including the films " Mulan 2 " and " Cars 2 " . He also has a popular blog among kids and adults : " Teatro de Bonecos " ( an action figure / dolls / toys blog ) that he created in 2008 . With the black dog puppet Tobias , a charismatic character and a symbol of creativity and simplicity among all the fans ( and also the " guardian " of the blog ) , he creates stories , comic strips and very funny videos . Briggs humorous claims that Tobias is his own " personal Brazilian Muppet " .