| Issue | #56 |
| Published | November 1966 |
| Frequency | monthly except November semi-monthly |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Stan Lee |
| Characters | Fantastic Four [Invisible Girl; the Thing; Mr. Fantastic]; Klaw |
| Genre | superhero |
| Pencils | Jack Kirby |
| Inks | Joe Sinnott |
| Reprinted | in Marvel Masterworks: The Fantastic Four (Marvel, 2003 series) #6; in Fantastic Four Omnibus (Marvel, 2005 series) #2; in Fantastici Quattro, I (Editoriale Corno, 1971 series) #52 |
| Characters | Klaw; Fantastic Four [Mr. Fantastic; Invisible Girl; the Thing; Human Torch]]; Wyatt Wingfoot; Inhumans [Black Bolt; Medusa; Karnak; Crystal; Gorgon]; Maximus |
| Synopsis | Klaw attacks the Baxter Building. |
| Genre | superhero |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | Joe Sinnott |
| Letters | Artie Simek |
| Notes | Kirby's co-plot credit is acknowledged by Lee and Kirby in many interviews. The actual credit reads "Produced by Stan Lee and Jack Kirby." |
| Reprinted | in Marvel's Greatest Comics (Marvel, 1969 series) #43; in Marvel Masterworks: The Fantastic Four (Marvel, 2003 series) #6; in Fantastic Four Omnibus (Marvel, 2005 series) #2; in Fantastici Quattro, I (Editoriale Corno, 1971 series) #52 |