Originally Posted by CyclopsWasRight
I took it as Loki imprisoned Odin and took the throne while pretending to be him.
Quite conveniant for Frigga to be dead as she's the one person who know Odin closely enough to see through the deception.
Yes, I too think Loki found a way to get Odin imprisoned somewhere.
As for convenient, being a good schemer is all about taking the action that's the most advantageous to the current situation.