They both first aired on American Television in September of 1984, with Voltron airing a week earlier. But Voltron is basically a redub of a Japanese series called Beast GoLion which started in 1981 so in that sense Voltron was first. read more
XxP.O.D.LxX The KGB Agent answer: Anecdotal sources suggest that Transformers came first as the comic (Marvel’s The Transformers) debuted on May 8, 1984. read more
The first season of Voltron, featuring the "Lion Force Voltron", was adapted from the series Beast King GoLion. The second season, featuring the "Vehicle Team Voltron", was adapted from the unrelated series Armored Fleet Dairugger XV. read more