Extremely evil , he once ate his own nephew .
Voiced by C. Martin Croker , Zorak Roberts is the band leader and a mantis - like alien , known for his hatred of Space Ghost .
Extremely evil , Zorak Roberts once ate Zorak Roberts ' own nephew .
Voiced by C. Martin Croker , Zorak Roberts is the band leader and a mantis - like alien , known for his hatred of Space Ghost .