In 1872, a young sculptor by the name of Zeffirino Poli left his village in the mountains near Lucca, in northern Tuscany, in search of a better life overseas. Only a few years later, he was at the center of the American cultural and artistic world. As the owner of more than 30 theaters across the North-East, his name had become a guiding light for an entire generation of performers and spectators. Despite his remarkable success, today his work has been largely forgotten. But two of his descendants, Tim in Connecticut and Luana in Tuscany, have started unearthing the memories and the tangible remains of S. Z. Poli's eventful life story. Intertwining past and present with archival material and animation, Mister Wonderland reconstructs Sylvester's journey from rural Italy to the glitz and glamour of the Roaring Twenties - revealing how a migrant's imagination helped shape American entertainment as we know it today.