Rayo Negro
It has been revealed that Black Bolt has been replaced by a Skrull impostor, in a time frame after "Silent War", but before "World War Hulk". The impostor revealed himself to the Illuminati and was killed. Both the sudden rift between Medusa and Black Bolt apparent in "Silent War" and Black Bolt's later defeat at the hands of the Hulk in "World War Hulk" could be attributed to this development, for it is uncertain just when Black Bolt might have been replaced by his Skrull duplicate.