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Cassius is a recurring character in the sixth season. He was portrayed by Sean Kuling and debuted in "The Children of Gabriel".

He is a member of the Sanctum Royal Guard, assigned to protect the Primes and maintain order in the town.

Early Life

He was born a red-blooded Null, and at some point he became a guard for the Primes.

Throughout the Series

In The Children of Gabriel, he returns to Sanctum after the red sun with all of the other residents. He later watches over Clarke Griffin and the members of Wonkru. He gets agitated when Jordan is going to the roof of the tavern to see Delilah. She tells Cassius that Jordan is fine. When a Child of Gabriel abducts Delilah, Cassius shakes Jordan trying to get an answer out of him; Jordan is hurt but points to a man running off with her. Cassius and Clarke run after the man into the lower fields. Cassius tells Clarke to go after the Child of Gabriel while he warns Russell Lightbourne. Russell tells him and Jade to lock down Sanctum.

In The Face Behind the Glass, he informs Russell Lightbourne that Cillian was a spy for the Children of Gabriel.

In The Gospel of Josephine,

In The Old Man and the Anomaly,

In Matryoshka,

In Ashes to Ashes,

In Adjustment Protocol,



Season Six
Episode Appearance Status
Red Sun RisingAbsent
The Children of GabrielAppears
The Face Behind the GlassAppears
The Gospel of JosephineAppears
Memento MoriAbsent
The Old Man and the AnomalyAppears
What You Take With YouAbsent
Ashes to AshesAppears
Adjustment ProtocolAppears
The Blood of SanctumAbsent


Cassius: "Yes, Sir!"

Notes and Trivia