TORONTO - Jack Osbourne says he doesn't worry anymore about the well-being of his dad, heavy metal megastar Ozzy Osbourne.

"Motorbikes can't kill him, drugs can't kill him," he mused in a recent phone interview from his parents' California house.

"He's one of these guys where he's going to be, like, 900 years old still complaining about everything and laughing. We joke that he's going to outlive me."

The British rocker's astounding ability to endure decades of hard partying, reckless stunts and heavy drug and alcohol abuse is one of the main themes of "God Bless Ozzy Osbourne," which will screen at participating Cineplex Entertainment theatres in Canada on Oct. 26 at 7 p.m. ET.

"There's only a handful of people that have done what he's done and lived to tell the tale," said Osbourne, 25, who produced the documentary.

The film opens with shots of a 60-year-old, long-haired Osbourne -- clad in all black and purple-tinted glasses -- in his dressing room jumping rope, riding a stationary bike and doing stretches as part of his pre-concert warm-up routine.

As we soon learn, the so-called Prince of Darkness is now over five years sober -- the longest stretch he's spent in recovery.

Gone are the days when he was so high or intoxicated he'd bite the heads off winged creatures, trash hotel rooms or have legions of TV viewers laughing at his incomprehensible speech and hunchbacked-shuffle walk on "The Osbournes."

"One of the key points that I wanted to put across for this film is that he's not this fumbling kind of stuttering, quirky guy," said Osbourne, who recently revealed he's expecting a child with his fiancee, Lisa Stelly.

"He's really quite astute and he's switched on and he's far from absent-minded. He's very aware and he knows what he wants and what he doesn't want."

Osbourne, who's appeared on various TV series, said a colleague encouraged him to do the project about four years ago.

When his parents gave the OK, he bought cameras, found a co-producer and hired director Mike Fleiss, who is executive producer of "The Bachelor."

Fleiss went on the road with Osbourne for a couple of months (one of the stops in the film is Halifax). Fleiss also interviewed Osbourne as well as his family members and various musicians, including Tommy Lee and Paul McCartney.

The filmmakers also use archive footage to detail Osbourne's life, from his poverty-stricken childhood in Birmingham, England to his drug-addled days with Black Sabbath and his time on "The Osbournes" TV reality series, when his alcoholism was at its peak.

Sabbath members say they used to order "cereal boxes" of cocaine to the house and Osbourne -- a long-haired prankster who wore heavy, black eye liner and fake fangs onstage -- would drink and do drugs until he passed out. His alcoholism became worse when his dad died and Sabbath famously fired him.

Osbourne, of course, eventually bounced back with a new band managed by his wife, Sharon. But his addiction issues plagued him, and his children -- Louis and Jessica from his first marriage; and Kelly, Jack and Aimee from his marriage to Sharon -- admit in the doc that he wasn't always a great father.

After about a dozen times in rehab, Osbourne -- as he explains in the film -- finally got the motivation to get sober for good over five years ago, when son Jack recovered from his addiction issues.

"I struggled with it because I don't want to take credit for what my dad had done," said Osbourne.

"He's the one who got sober -- I just yelled at him -- so I always feel awkward when people go, 'Oh, you helped.' I go, 'No, I didn't. I just had an argument and he kind of lifted himself from it."'

As we see in the doc, one of Osbourne's biggest goals when he got sober was to get a driver's licence -- something his addiction issues prevented him from doing until now.

"I actually sat outside on the porch looking at his Ferrari Italia, which is I think is the most amusing thing to me about it," said Osbourne.

"He has not driven me yet, which is really strange, probably because whenever I turn up he's like, 'You drive.' Even though he's got his licence and he's really stoked about it, I don't think he likes driving."

"God Bless Ozzy Osbourne" premiered in the spring at the Tribeca Film Festival.

Osbourne said he feels this is the first documentary that truly represents his dad's "life as a person."

He also feels it sends a message to addicts that "it is never too late."

And what's Ozzy's reaction to the film?

"He's seen it once since it got completed," said Osbourne.

"He didn't say it to me but he said it to my mom on the way home from the theatre: 'I'm not that bad, am I?"'