K.C. Martel is an American former actor who worked extensively in film and television during the late 1970s and 1980s. He is best known for portraying Greg in Steven Spielberg's E.T. the Extra-Terrestrial, as well as for his recurring role as Eddie Gregg in the television series Growing Pains. Martel also appeared in films including White Water Summer and made guest appearances in numerous television series of the era. After retiring from acting in the early 1990s, he stepped away from the entertainment industry.