Robin Williams' son Zak has revealed that his dad "didn't always feel like he was succeeding" despite being the "most successful person I know" in the first trailer for HBO's new documentary about the stand-up.
Robin Williams: Come Inside My Mind, which is out on 16 July, will cover Williams' whole life and work until his death in 2014, and will include interviews with loads of Williams' contemporaries and comedy luminaries including Steve Martin, Eric Idle, Billy Crystal, David Letterman and Whoopi Goldberg as well as Zak Williams.
The film includes a lot of unseen footage as well as the talking heads and is mostly narrated with quotes from Williams himself. It'll also explore Williams' struggles with addiction to drugs and alcohol, and the depression which effected him throughout his life.
This story originally appeared on Esquire.co.uk.
* Minor edits have been made by the Esquiremag.ph editors.