Cartoon Network Enterprises is launching a line of Captain Planet T-shirts for men, women, and kids via a deal with Local Celebrity. The green-haired icon and star of the ’90s TV series, “Captain Planet and the Planeteers,” is already on shelves at high-end, specialty, and department stores. The show, currently on Boomerang, was created by Ted Turner and features an eco-friendly superhero who teaches children about potential environmental hazards. A 12-hour marathon is planned in April in celebration of Earth Day 2008.