Avengers Volume 1 #186

Chthon appears as a cloud entity and possesses the Scarlet Witch.
1st appearance of Magda, the wife of Magneto and mother to Quicksilver and Scarlet Witch.
Origin of Scarlet Witch and Pietro, told by Bova.
Hinted that Magneto is the father of Quicksilver and Scarlet
Witch.

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