4. Zero Hour

Complete story — includes the ending

Jason tells Alec what he told Emily, and Alec says that he is no longer the same man as Jason's father. When Brad gives Kiera the address to a storage facility, Carlos and Kiera investigate and find a dialysis machine. Jason shows Alec his mother, and Alec gets her number, even though he's not supposed to meet her yet. Later, Curtis explains to Kiera and Alec that the Traveler's job was to minimize the effects of time travel, but that he changed something and erased his own future, and he's been trying to repair everything. The Traveler sends Alec forward in time, where he encourages his older self that time travel is possible and gives him the name Kiera Cameron, setting the events of the series premiere in motion; but he also learns that his older self pushed his wife to suicide. Kellog learns that his older self needs him for a kidney transplant. Zorin says that the machine is a life boat to bring people from the future back to this time, including Brad's family; Alec calls it a wormhole, and says it could also send people to the future.