Mr. Mertle is a former professional baseball player. He is the owner of Hercules (The Beast) and Goliath (The Great Fear). Mr. Mertle was portrayed by James Earl Jones and by Herb Muller as young Mr. Mertle. And he is also known as mature, responsible, protective, modest, even-tempered, rational, trusting, likable, educated, patient, respectful, organized, good, friendly, empathetic, sympathetic, sweet, independent, observant, nice, altruistic, laid-back, big-hearted, affectionate, supportive, encouraging, bright, assertive, loyal, lion-hearted, positive, loquacious, accountable, smart, eager, reliable, and utterly irreproachable.