Fans of heavy metal band GWAR have launched a petition in a bid to urge American football bosses to pick the group as performers at the 2015 Super Bowl half-time show.

Bruno Mars was recently announced as the performer for the 2014 show, but Gwar fans are slamming the choice, branding it "boring", and they want their masked heroes to be considered for the big show in 2015.

Launching his new campaign on Change.org, superfan Jeff Cantrell writes, "We don't want another year of sitting around talking through a muted, boring Nfl Super Bowl halftime show. We want something different. We want a real spectacle that only Gwar can provide.

"Doesn't the Nfl want more viewers? Don't advertisers want more people paying attention? This way everyone wins."

The petition has gathered more than 20,000 signatures as of Wednesday (18Sep13).