The Eternals are a group of 100 evolutionary humans in the Marvel Universe created a million years ago by the Celestials.
All possess enhanced physical attributes and choose to specialize in particular powers and attributes. They are extremely long-lived, and even virtually immortal. They can join the Uni-Mind, which is created when several Eternals join their will and intelligence together to temporarily become one powerful entity.
They formed an alliance with the Olympians, the gods of Ancient Greece, and the Eternals acted as the gods' representatives on Earth for a while.