Eugene was a 12 - year - old kid who was a friend of Mork 's , and took violin lessons from Cora , Mindy 's grandmother .
Later that year , he was cast as Eugene in the first season of Mork & Mindy .
Eugene was a 12 - year - old Eugene who was a Eugene of Mork & Mindy 's , and took violin lessons from Cora , Mindy 's grandmother .
Later that year , he was cast as Eugene in the first season of Mork & Mindy .