S4, E4: Hiro's health continues to deteriorate as he goes on a mission to prevent a co-worker from committing suicide, and Ando finally convinces Hiro to tell his sister that he's fatally ill. Meanwhile, Tracy continues to struggle to find a purpose in life and to learn to control her powers. She returns to her old job as a political adviser, but leaves when she remembers how demeaning the job could be.