My first encounter with the Sentinels care of Whilce Portacio. In retrospect, these things are terrifying. Those on the attack, bursting through the ceiling, are like the front runners of some wild tribe of cancerous electronic vikings, screaming their endless hatred as they tear apart and impale their cybernetic prey. Looking at the Sentinel in the rear, mouth closed in focused attention, one can animate the scene, transitioning from hunt to violent assault.
Uncanny X-Men 281, Oct. 1991.
