A loyalist of former prime minister Dr Mahathir Mohamad has dubbed 'Anwar: The Untold Story' a "useless, nauseating" watch.

According to Khairuddin Abu Hassan, the biopic that documents Prime Minister Anwar Ibrahim's arduous political journey is aimed at slandering and tarnishing Mahathir's image.

"I just finished watching 'Anwar: The Untold Story', which was a nauseating watch.

"The film elevates him (Anwar) to the status of...