Hammond's next acting role came in 1970, when he appeared in Conduct Unbecoming. This was his first role as an adult. In 1972, Hammond appeared as Peter Linder in Skyjacked. In 1973, he made a guest appearance on The Brady Bunch, in season 4, episode #090, "The Subject Was Noses", as the high school hunk, Doug Simpson, who loses interest in Marcia after her tragic football accident. That year, he also appeared The Waltons episode, "The Townie", as Theodore Claypool, Jr.