Robert L. Robertson was part of the Battle of the Planets voice cast. He was a friend of Alan Dinehart who wanted to break into show business. He did record parts for Battle of the Planets, although it is unknown if any ever made it to the final aired episodes. Alan Dinehart, Jr. recalled his father asking him in to re-record Robertson's parts as soon as his sessions were over. There is no other information known about him, nor the roles he played in the series.