The Metal Saga consists of the anime, Beyblade: Metal Fusion,Beyblade: Metal Masters and, Metal Fight Beyblade 4D. They serve as a spin-off of the original Beyblade series with all new characters and Beyblades. It started in 2010 (2009 in Japan) and is currently running. It airs on TV Tokyo in Japan and is licensed for distribution internationally and co-produced by Nelvana, who also distributed the original Beyblade series internationally. Each season currently contains 51 episodes with the exception of Metal Fight Beyblade 4D which is currently still airing episodes every Sunday.