In season one, two siblings look to uncover their family's connection to the secretive organization known as Monarch. Clues lead them into the world of monsters and ultimately down the rabbit hole to Army officer Lee Shaw, taking place in the 1950s and half a century later where Monarch is threatened by what Shaw knows.

Season two picks up with the fate of Monarch — and the world — hanging in the balance. Buried secrets are revealed that reunite our heroes (and villains) on Kong's Skull Island, and a new, mysterious village where a mythical Titan rises from the sea. The ripple effects of the past make waves in the present day, blurring the bonds between family, friend and foe — all with the threat of a Titan event on the horizon.