A powerful hero made famous by the MCU just returned to life six years after a canon death that fans assumed would last way longer. Here's what it means to see this hero again, and what the fallout ...

Gifted with the All-Seeing Sight, Heimdall has the honor of protecting Asgard as its Gatekeeper. With his enchanted sword he controls the Bifrost, carefully guarding passage between the Nine Realms.