The primary antagonist, "President Morty" (Evil Morty), reveals the Citadel’s darkest secret: it is a "breeding ground" designed to ensure a constant supply of Mortys to serve Ricks. Rick and Morty S5E10: Evil is Relative in 'Rickmurai Jack'
Unlike the "fake" memory from season three, we learn that a Rick from another dimension (Rick Prime) actually killed Rick’s original wife and daughter. [S5E10] Rickmurai Jack
Rick spent years hunting Rick Prime, killing countless other Ricks in the process. The primary antagonist