Megna appeared in many television programs throughout the 1960s and 1970s; he portrayed a near-blind child in the Naked City episode "A Horse Has a Big Head - Let Him Worry!", one of the "Onlies" in the "Miri" episode of Star Trek: The Original Series, Stephan in I Spy (1967), and Little Adam in the NASA-produced animated shorts The Big World of Little Adam.