The world sadly lost one of its greatest entertainers when Robin Williams passed away [1] at the age of 63 in 2014. Now, HBO is giving fans a sneak peek into the life and career of the man behind the big screen with an intimate documentary titled Robin Williams [2]: Come Inside My Mind. The film, which premieres on July 16, will feature interviews from those who knew the comedian closest, including Billy Crystal, Whoopi Goldberg, David Letterman [3], and Steve Martin [4], among others. Watch the trailer above to get your first look, and don't forget to set your DVRs — this looks like one you won't want to miss.