Halo

Pablo Schreiber plays Master Chief, Spartan-117 / John-117, a supersoldier fighting to protect humanity from the alien threat.

Natascha McElhone portrays Dr. Catherine Halsey, a brilliant scientist responsible for the creation of the Spartan soldiers.

Joseph Morgan takes on the role of James Ackerson, a high-ranking officer in the United Nations Space Command.

Shabana Azmi plays Margaret Parangosky, a powerful figure within the military hierarchy of the United Nations Space Command.

Christina Bennington provides the voice for Cortana, an advanced AI system assisting the Spartans in their missions.

Natasha Culzac is Riz-028, a skilled Spartan supersoldier and part of Master Chief's team.

Olive Gray plays Dr. Miranda Keyes, a scientist with significant importance in the ongoing conflict.

Yerin Ha portrays Kwan Ha, a civilian character caught up in the struggle between humans and the Covenant.

Bentley Kalu is Vannak-134, a Spartan supersoldier fighting alongside Master Chief.

Kate Kennedy plays Kai-125, another member of the elite Spartan team battling the Covenant forces.

Charlie Murphy portrays Makee, a character with deep ties to the covenant.

Fiona O'Shaughnessy takes the role of Laera, a character whose details are less defined in the narrative.

Danny Sapani plays the character Jacob Keyes in Halo. Keyes is a highly skilled military officer and a prominent figure in the Human-Covenant war.

Jen Taylor provides the voice for Cortana, an artificial intelligence companion to Master Chief. Cortana assists Master Chief throughout the series, providing information and guidance during their missions.