Way back when, Seaman and Price adapted Who Censored Roger Rabbit?, a novel by Gary K. Wolff. The hard-boiled mystery drew upon the history of the Los Angeles transit system and provided a strong framework for a dazzling mixture of traditional cell animation and live-action period footage. Wolff wrote a sequel, Who P-P-P-Plugged Roger Rabbit?, and other follow-up ideas have been discussed over the years, but Zemeckis says he wasn't involved in any of them.
Of course, any sequel script would need to be very, very good on its own merits to have any hope of living up to the original. In view of Zemeckis' fascination, nay, obsession with performance capture digital tools, I share Elisbeth's fear that a new Roger Rabbit will be "a dead-eyed motion capture and not a lovable toon." The original was a mystery, a comedy, and a thriller, but it was the idea of brightly-colored cartoons living side by side with humans in a mundane real world that gave the film its distinctive flavor. Whose performances will be computer-animated in the sequel -- humans, 'toons, or both?