In the year 2552, humans on the planet Madrigal have been fighting for independence from Earth, but a fatal encounter with the Alien Covenant changes everything.

John takes Kwan to an old friend and learns more about the mystery object. Dr. Halsey has a plan.

John meets his new partner, and he discovers secrets inside his own memory. Kwan wants to return to Madrigal to continue her people's fight for independence, but Soren has other plans for her.

Guided by his visions, John takes Halsey and Cortana back to where it all began, looking for answers from his past. With Soren along for protection, Kwan goes in search of an army.

On the run and out of options, Kwan and Soren have a difference of opinion. John makes a horrible discovery.

Survivors from battle return to Reach. John confronts Dr. Halsey, and the lies of his past. The new prisoner seems to know John better than he knows himself.

Kwan's journey to uncover her family's "true purpose" takes her deep into the deserts of Madrigal. Soren obsesses over unfinished business.

John and Makee come to terms with their shared vision. Halsey has one last chance to save her mission, and herself.

Beaten, battered, and betrayed, John 117 leads the Spartans on a suicide mission to find the Halo and save humanity.