The Martin Scorsese-produced and Amir Bar-Lev-directed Grateful Dead documentary, which was first announced in October 2014 as a 50th anniversary project on the band but has seen delays in production since, has reportedly expanded to a four-part miniseries that may see its premiere at the Toronto Film Festival in September, Roger Friedman’s Showbiz 411 reports (via JamBase).

As Friedman writes, the scope of the project has broadened, now including “everyone who was ever attached to the group…all the members and families and musicians.” While there apparently won’t be much input from outside sources from the the jam scene and music world, like ( Friedman writes) Phish, Dave Matthews or Bob Dylan, he adds, “The archival footage is said to be amazing.”

As previously noted, Justin Kreutzmann, filmmaker and son of Dead drummer Bill Kreutzmann, is attached to the project as a producer, along with Eric Eisner and Nicholas Koskoff. Scorsese’s Sikelia Productions will serve as executive producer.