The series premiered on September 28th, 2007 with Season One, Act I, "There You Are". An average of five or six episodes are produced each season, released at irregular intervals, with special episodes and interviews interspersed throughout. The series has been in production for three seasons, and is currently in production. Excelsior was originally a role playing game played by email, when the creators James Heaney and Mike Hennessey decided to try and produce Excelsior's story in the form of an audio drama.