This is my take on the events of "Thor: Ragnarok." It was started when very few details were actually known about the plot. It is in no way canon compliant. Plot heavy. References to mythology mixed with MCU canon. Action sequences (and some gladiators!)

Agent Romanov is called to S.H.I.E.L.D after an extended absence. There she learns of 2 prison breaks, the 1st at the Raft in NY harbor and the second at the Vault in the Rocky Mountains. In the case of the Raft, 3 notable survivors were seen, including 2 witnesses who are oddly reluctant to speak. The 3rd is a mysterious but powerful sorcerer who seems to have a deadly agenda.