The first season of ABC's BattleBots was held in Vallejo, California from May 21st, 2015 to May 23rd, 2015. It was the first tournament under BattleBots' new format which featured a single 250-pound weight class competing in a modified single-elimination format. The show debuted on ABC a month later on June 21st and spanned for six weeks.
Twenty-four robots were selected from applications to compete, with another four selected as reserves. The chosen 24 competed in one qualifier round to determine who would advance to the first round of the main bracket, with another four being selected from a specific committee to serve as 'wild-card' entrants into the bracket.