Director Spike Lee (L) and Mike Tyson speak onstage during the "Mike Tyson: Undisputed Truthts" panel discussion at the HBO portion of the 2013 Summer Television Critics Association tour - Day 2 at the Beverly Hilton Hotel on July 25, 2013 in Beverly Hills

Director Spike Lee (L) and Mike Tyson speak onstage during the “Mike Tyson: Undisputed Truthts” panel discussion at the HBO portion of the 2013 Summer Television Critics Association tour – Day 2 at the Beverly Hilton Hotel on July 25, 2013 in Beverly Hills

*HBO will air the Spike Lee-directed “Mike Tyson: Undisputed Truth” next month, bringing the former boxing champ’s stage show to those who were unable to see its Broadway run or catch it on tour.

Reviews of the stage production were mixed – with some critics crediting Tyson’s charm with salvaging an otherwise “ham-handed and manipulative” experience, as one New York Times reviewer wrote.

One thing Lee wants to make absolutely clear to viewers of his HBO film version is that everyone involved in the one-man show took it seriously.

“There is a script. Mike’s beautiful wife Kiki Tyson wrote the script. And Mike was not up there just winging it,” he told critics at the TCA Summer Press Tour. “We worked. The origin is we did this last summer on Broadway for two weeks. And we had a full-week intensive rehearsal period before that. So this is not some willy-nilly stuff. I mean, Mike worked very, very hard. This is a script. This is legit.”

Below, Tyson admits that he didn’t always take acting seriously before “Undisputed Truth.”

“Mike Tyson: Undisputed Truth” premieres Saturday, Nov. 16 at 8 p.m. Watch the trailer below.