The season finale’s shockers don’t end there. Cal visits the tailfin earlier, in an attempt to discover the source of all his callings. Against Ben and Grace’s wishes, he goes to Eureka to touch the tailfin but then disappears. Ben and Saanvi attempt to save Cal by returning to the ocean the tailfin, which Ben discovered in the season premiere. They’re too late.
Cal said goodbye to his dad after Ben finally meets Cal on Flight 828 via a calling. “This is how it has to be.”
At the end of the episode, viewers learn what Cal meant when he returns to the Stones’ home to bid Grace farewell. In a shocking twist, Cal reappears as a teenager, the same age he would’ve been if he had survived the crash.