The Great Beasts are a group of powerful creatures from another dimension who have tried several times to take over Earth. They were trapped a thousand years ago in their own dimension by the gods of northern Canada but the magicks holding them began to weaken recently. Nelvanna, one of the gods mated with a human and gave birth to Narya who would become the Alphan Snowbird.
The first Beast to break through the Great Barrier was Ranaq, just over a hundred years ago, by temporarily possessing a man who was trying to use Ranaq for his own needs. A time travelling contingent of Alpha Flight was able to beat him though, forcing him back to his own dimension.
The next Beast to break free was Tanaraq, who broke free when Walter Langkowski attempted to turn himself into a second Hulk. The two formed a symbiotic relationship wherein Walter would temporarily change places with Tanaraq in the Beasts' own dimension, the Realm of the Beasts. Snowbird had no choice but to eventually slay Tanaraq after he took control of Langkowski. 
Tundra broke free before this ever happened as it took some time before Tanaraq controlled Walter. He was called upon by the man who was Narya's father who had gone insane. Shortly after that Kolomaq broke free but Narya was able to defeat him once again.
Alpha Flight had to venture into the Realm of the Beasts to find Walter's soul. It was there that they encountered the other Beasts; Kariooq, Somon and Tolomaq. Four of the Beasts were able to return to Earth when Somon (who was mistakenly believed to be destroyed) affected Langkowski's subconscious into creating a formation which allowed them to break the dimensional barrier. A powerful explosion, created when Box destroyed Tundra, sent the Beasts back to their dimension.
- 9 Great Beasts (Earth-616) Members
- 17 Appearances of Great Beasts (Earth-616)
- 1 Minor Appearances of Great Beasts (Earth-616)
- 6 Media Great Beasts (Earth-616) was Mentioned in
- 6 Images that include Great Beasts (Earth-616)
- Team Gallery: Great Beasts (Earth-616)