The actor suffered a highly public meltdown and was fired from his sitcom 'Two and a Half Men' in 2011 following a nasty feud with show bosses.
Sheen's bizarre antics became headline news and he appeared to capitalise on his notoriety by setting off on a comedy tour of the US and Canada, called 'My Violent Torpedo Of Truth/Death Is Not An Option'.
However, many of the shows were met with mixed reviews from audiences, and some disastrous gigs ended in walkouts and heckling.
Sheen, who was one of America's best-paid TV actors during his time on "Two and a Half Men", has now explained he only set off on the tour because he needed the money after he lost his job.
"It was brutal. I was not winning at all. I think what a lot of people don't realise is I was completely broke, because, you know, when they kept my back end and fired me and all that, I didn't have any money left. So I was using the tour to actually pay child support and mortgages and stuff like that. You know? So I'm grateful for that," he said.