Fantastic Four #15 CGC 5.5 1st appearance of the Mad Thinker (cert 7006)

Why it's Hot:

• 1st appearance of the Mad Thinker
• 1st appearance of the Awesome Android
• Letters page includes a fan letter from future writer and Editor-In-Chief, Roy Thomas
• Stan Lee story
• Jack Kirby and Dick Ayers cover & art

Synopsis:

The Fantastic Four battle the Mad Thinker and his awesome Android! The Android...neither animal, nor vegetable, nor mineral...what is it?!