Etranges Aventures #23

Mordo places a spell over Strange's house that causes it to vanish to another dimension. Strange manages to track Mordo down using his ethereal form, but it becomes trapped in Mordo's lair. Mordo goes to see The Ancient One, claiming he's changed his way, just so he can attack him unawares. But Strange had found a way to escape by going straight thru the center of the Earth itself, and warned his mentor in advance. Though defeated, both Strange and The Ancient One know Mordo is becoming more powerful all the time.