The lead actor in an upcoming miniseries about Ian "Molly" Meldrum says the show does not go far enough in exploring its subject's sexuality.

Molly follows the life of Meldrum, who rose to national fame as the face of ABC television's Countdown music show.

Samuel Johnson plays Meldrum in the miniseries which screens on Channel Seven in February.

Johnson told 774 ABC Melbourne's Jon Faine that he was unhappy with some decisions made during the final edit of the series.

"I'll tell you something I probably shouldn't," he said.

"There's a scene where I kiss a bloke ... Molly actually cut the kissing scene.

"As we kiss it cuts out."

Johnson said he expressed his disappointment in the decision to Meldrum, who was a consulting producer on the series.

"I said, 'Molly, why would you cut that out', and he said, 'I thought it was gratuitous'," Johnson said.

"I wanted the kiss in, I wanted it to be in there, it wasn't gratuitous at all.

"It's a part of his life, and it was a part that we needed to show whether people like it or not — I mean it's 2016 for Christ's sake."

Meldrum 'protective of his image'

Molly Meldrum is reportedly in a Thailand hospital after suffering a fall outside a Bangkok hotel. ( AAP/Channel Seven )

Johnson said he was still wrapping his head around the decision to cut the kiss from the final version of the two-part series.

"Molly's very protective of his image, you know, he doesn't want to be seen to be a smoker and he's been chain smoking since he was 10," Johnson said.

"I don't think he wants to be seen as either gay or hetero, either, I think he's just pro-human."

Channel Seven has been contacted for comment.

Meldrum is reportedly spending his 73rd birthday in hospital in Thailand after suffering a fall outside a Bangkok hotel.

As host of Countdown, Meldrum launched the careers of many Australian bands and musicians including AC/DC and Skyhooks, and introduced local audiences to international acts including Madonna and Michael Jackson.