When a powerful alien threat arrives on Earth under mysterious circumstances, Barry, Iris and the rest of the team are pushed to their limits in a desperate battle to save the world.

Agam Darshi, Brandon Routh, Caitlin Diaz, Carmen Moore, Emily Schoen, Eston Fung, Keyosha Waugh, Kimberley Mercado, Lindy Booth, Malcolm Masters, Meena Mann, Megan Peta Hill, Rachel Drance, Ryan Jefferson Booth, Shaun Omaid, Shayan Bayat, Stephanie Izsak, Tony Curran, William Fielding