Tilly shows Calvin around the Alchemy room, and Isaac's swag he's collected over the years. Calvin has a trusty blade that he's carried around since the Marines, and he wants Tilly to treat it for supernatural effectiveness.
Garvey's boy toy managed to dig up some stuff from the Dark Web on Calvin. He served in the bloodiest battles in Afghanistan and Iraq, got a bronze star…but then his records disappeared. What happened?
And in the middle of the night, The Dredge saps the youth of a young man doing laps at the local field. He emblazons on his hand an insignia, and uses him as his eyes and ears. His much younger and healthier eyes and ears.
This was the bait to get the rest of the family to come down to the chiller, and ambush them. But they fight back. They fight back hard. Using a combination of hydrochloric acid, some hand bonsaws and knives, they thwart the enemies.
But that was just the beginning. The Dredge is sending other reanimated corpses in to relay a message to the family: he wants the ring of Solomon, which is in Isaac's possession. The corpse burns Isaac's chest with his insignia hand, but Calvin drives his blade through it, and cuts off its life force and communication with The Dredge. Plug pulled.