What did he play, R2D2?
He played a Viet Cong an Ewok in Empire Strikes Back. He claims he also donned the R2-D2 costume when Kenny Baker wasn't available, but this guy was 4' 4" tall. Kenny Baker, who actually played R2, was only 3' 8". A difference of 8 inches. I seriously doubt Grant fit in the R2 costume.