At the same time, he also had his first voice acting role in a cartoon, that of Cavin in the Disney cartoon TV series Disney's Adventures of the Gummi Bears, as well as being the young announcer of the (new) Mickey Mouse Club and other Disney informercials. This was followed soon afterwards by the role of Eddie Munster in the TV series remake of The Munsters titled The Munsters Today. He continued this role for two years, while still attending elementary school. He played Alan Quartermaine, Jr., in the American soap opera General Hospital. Marsden booked his first major role, a movie called Robot Jox.

Marsden was discovered by producer Bud Barth of Del Mar Media Arts. Jason and his parents moved from Rhode Island to Fullerton, California in August 1985 when he was 10, where he attended Laguna Road Elementary School while pursuing his acting career. Born in Providence, Rhode Island, Marsden's mother, Linda Marsden, is a former fashion model, and his father, Myles Marsden, is a former Premier danseur of the Yugoslav National Ballet and Founder of the first regional ballet company in New England called State Ballet of Rhode Island.

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