Esc Online is a free 3D multi-user online nightclub being developed for the PC. A new way for people to socialize online, it combines music, dance, and chat, and allows scripted and live characters and performances. Esc is a natural forum for creating autonomous or semi autonomous characters that interact with real people. For believable agents researchers, Esc provides an established engine with an existing community for technical support and a ready audience. In addition, our team can work directly with a small number of researchers to help them bring their ideas into Esc. The project is described, possible models of character interaction are discussed, and an overview of technical details is presented.