season 4 could see the fake Harry (Mantid in disguise) wreaking havoc as the real Harry's allies try to find a way to rescue him from the clutches of the evil Greys.Furthermore, Mike's discovery that aliens are real will undoubtedly transform his character after years of suspicion, and he might come around to helping Harry's cause. Either way, Resident Alien season 4 will start with Harry in a precarious position, and the destruction of Earth seems more imminent than ever before.