william friedle (; born august 11, 1976) is an american actor, voice actor, writer and comedian. he is best known for his comedic roles, most notably the underachieving elder brother eric matthews on the long-running tv sitcom "boy meets world" from 1993 to 2000. more recently, he has voiced a number of animated characters such as terry mcginnis/batman, the title character of "batman beyond", and ron stoppable of "kim possible". he voices deadpool in "ultimate spider-man" and star-lord in the animated version of "guardians of the galaxy", replacing chris cox. he also performed the voices of doyle in "the secret saturdays", lion-o in the rebooted "thundercats" series, and blue beetle on "". he has been the speaking voice of bumblebee in the final episode of "" and the movie "" and in the stand-alone sequel series , as well as in "".