While Emily decides to become a doctor like her parents, Nikolas recovers his memory, leading to a distraught Mary going insane. A masked Mary goes after Emily, killing Sage Alcazar and another teenager in the process before Nikolas is able to shoot her. Nikolas and Emily become engaged again. Helena Cassadine, Nikolas' grandmother, attempts to kill Emily, and Nikolas throws Helena over a cliff. Emily testifies he was protecting her. Emily was then kidnapped by Connor Bishop, Mary's husband who had gone AWOL and faked his death. Nikolas, Lucky, Elizabeth, and Emily debate about turning Connor in for being AWOL, but agree to help him escape from Canada. When Connor foils their plans, Nikolas turns himself in for Helena's murder. Connor is arrested. Nikolas, after being allowed to marry Emily, is sentenced to life in prison, with the possibility of parole.