What is the final stage of mitosis where the nucleus re-forms?

The final stage of mitosis is telophase. During telophase, the chromosomes that have been separated during anaphase begin to de-condense back into chromatin, and the nuclear envelope re-forms around each set of chromosomes at opposite poles of the cell. This re-formation of the nucleus signifies the completion of the mitotic division, as the cell prepares to enter cytokinesis, where the cytoplasm divides and two daughter cells are formed. The key characteristic of telophase is the return to interphase-like conditions, marked by the re-establishment of the nuclear boundaries, allowing for the proper functioning of the new cells.