Metal Super Saiyans are powerful emulations of the Super Saiyan form.
Overview
In the original Japanese version of Dragon Ball Z: The Return of Cooler, Meta-Cooler Core states that he plans to use the Super Saiyan energy taken from Goku and Vegeta to create an army of Metal Super Saiyans.
Video game appearances
In Dragon Ball Fusions, Bulma's creation Mecha Goku is capable of transforming into Super Mecha Goku.