Metalfencer is a Trap Bakugan that enhances Viper Helios's fighting skills. His three blue eyes can freeze opponents, making them easy to defeat. Not only can his long tail shoot lasers, but it can also wrap and squeeze his opponents tightly, eliminating them with its deadly stinger. His four mighty legs provide tremendous maneuverability.
It was used by Spectra in Show Me the Power! where it combined with Viper Helios to form battle unit mode. It was knocked off of Viper Helios by Neo Dragonoid, but it was not defeated, however, Helios asked Spectra for more power and Spectra used the Forbidden Card to win that battle.
It was used again in Dude, Where's My Bakugan? to save Viper Helios from Apollonir's Saiam Low ability by combining to make Battle Unit Mode, however, Apollonir still managed to beat Viper Helios and Metalfencer.
Red Valkyrie: Adds 200 Gs to Metalfencer and another Bakugan you have on the field.
Sharing the word 'Fencer', PyrusAttribute, and similar structure, the relationship between Fencer, Metalfencer, and Spyderfencer is unknown other than the fact that they can all transform, combine, have four legs, and are all mechanical Bakugan created by the Vestals.
They all have a relation with Maxus Bakugan. Fencer and Metalfencer can both combine with Helios and Spyderfencer can help form Maxus Dragonoid which is related to Maxus Helios by the Maxus Bakugan.
Metalfencer's combining feature can combine with BakuNano compatible Bakugan as well as Viper Helios and Cyborg Helios.