In the original Harry Potter books, Barty Crouch Jr., The villain that troubled me the most, was forcibly cut off from the plot after completing his mission in the fourth film. There was no other way. If he was included in the protagonist group in the later period, the creation difficulty of defeating Voldemort would increase exponentially.
But if it is a normal narrative, the background setting of this article is that after Voldemort was resurrected, little Barty returned to his master, and the Death Eaters also completed a large-scale prison break.
Purpose: Little Barty completed the Triwizard Tournament mission according to the normal narrative and returned to his master