Fear the Walking Dead, which hit the air in 2015, acts as a prequel. Knowing that the show doesn't incorporate time travel into its zombie-laden plots, it's safe to assume that the timelines are about to clash. Fear focuses more on the outset of the zombie apocalypse, whereas the original series is more about survival after the outbreak. Variety notes that the crossover event could be a huge boon for Fear, since audiences have been dwindling for the spin-off since its debut season.