<Li> Cary Guffey as Barry Guiler, Jillian's young child abducted in the middle of the film . Spielberg conducted a series of method acting techniques to help Guffey, who was cast when he was just three years old . </Li> <Li> Bob Balaban as David Laughlin, Lacombe's assistant and English - French interpreter . They meet for the first time in the Sonoran Desert at the beginning of the film . His former position as a cartographer allows him to interpret the alien signals as coordinates leading to the meeting at Devils Tower . </Li> <Li> Josef Sommer as Larry Butler, a man who meets Roy and Jillian in Wyoming and attempts to scale Devils Tower with them . </Li> <Li> Lance Henriksen as Robert, Lacombe's assistant </Li>

Close encounters of the third kind spanish title