So what's the first thing Earth's premiere mutant terrorist does with his newfound thralls? Uses them to take over the government? Forcibly enact a pro-mutant agenda across the globe? Help him replace all those Betamax tapes he accidently magnetically erased? No. He does not do that. Instead, he forces the Scarlet Witch to go-go dance for him.
Splash page from Avengers #111, May 1973, script by Steve Englehart,
art by Don Heck and Mike Esposito
Oh, ick. That's your daughter, Magneto.
To be fair to ol' helmet-hair, he didn't know that at the time. Neither did she. Even Snazzy Steve Englehart didn't know. Actually it wasn't until six years later, in X-Men #125 (1979), that we all started to put the pieces together of why Quicksilver's funky hair looked so familiar (although it would take until 1983, another four years, until Vision and the Scarlet Witch #4, for a proper Magnetic Family Reunion).
Still. Ick. You gotta know Marvel was hoping no one would remember that panel ten years later. As Joey the Q likes to say: "Read that again, knowing what you now know about Wanda." Aiyyyyiii! No thank you!
I hereby summon the power of Magneto's blood-brain warping thingee magno-powers to wipe it all out of our memories! (Please?)