Here is the plot summary of Undisputed II: Last Man Standing: In this gritty and intense sequel, heavyweight boxing champion George "Iceman" Chambers (Michael Jai White) finds himself behind bars in a Russian prison, accused of drug possession. As he navigates the harsh realities of life inside the maximum-security facility, Chambers is forced to confront his own mortality and the cruel machinations of the prison system. Determined to clear his name and regain his freedom, Chambers agrees to participate in a high-stakes fight against the reigning champion of the prison's underground fighting circuit, Uri Boyka (Scott Adkins). Boyka, a ruthless and cunning fighter from Eastern Europe, has built a reputation as a formidable opponent who will stop at nothing to emerge victorious. As the two fighters prepare for their epic battle, tensions rise and alliances are tested. Chambers, desperate to prove his innocence and secure his release, must dig deep within himself to uncover the truth behind his imprisonment and confront the dark forces that seek to destroy him. Meanwhile, Boyka remains a constant thorn in Chambers' side, using every trick in the book to gain an advantage and crush his opponent's spirits. As the fight draws near, both men are forced to confront their own demons and the harsh realities of life behind bars. In the end, only one man can emerge victorious in this brutal and unforgiving world. Will it be George "Iceman" Chambers, determined to clear his name and regain his freedom? Or will Uri Boyka prove too strong, too ruthless, and too cunning for even the greatest boxer of all time?