Crossovers That Should Not Be XVII: Post 16 threads, and what'd'ya get?

[SkyeFire]

Odin looked very nearly as grim as Thor recalled him being during the Convergence. "My son... it saddens me that this has become necessary, but I must now entrust to you knowledge of one of the deepest secrets buried in Asgard's history. The existence of the Tenth World."
Thor blinked, recalling something he had come across on the Midgardian "internet" whilst researching humanity's memories of Asgard. Surely not... "Cephiro?"
Odin blinked in turn. "What? No, that name is unfamiliar to me. I refer to... Equestria."
Thor: The Equestrian World
"So... Sleipnir... and Loki....?"
Odin sighed painfully. "There are reasons why there has been no contact between Asgard and Equestria over the Rainbow Bridge over the last thousand years.  Now, however, the situation has... changed.  And Sleipnir would like to visit his mo-- er, fa... parent."