Fantastic Four #153 (Pt 21) Panel 6, Penultimate Page - Alicia and Ben...and Zardoz?!

Fantastic Four #153 (1974) Buckler

Fantastic Four #19 (1963) Kirby

Fantastic Four #153 (1974) Page 30

Fantastic Four #153 (Pt 5) Mahkizmo, Thundra, Rama-Tut--But Where's the Mutated Blood-Slug?!

You've probably seen a few of these panels before, as this sequence from 1974's FF #153 has frequently been cited as a textbook example of Kirby-inspired art.      

Fantastic Four #153 (1974) Rich Buckler

The source is Fantastic Four #19: the last two panels on page 11...

Fantastic Four #19 (1963) Jack Kirby 

...followed by these two panels at the top of the next page. 

Fantastic Four #19 

Fantastic Four #153 (Pt 4) Mahkizmo and Rama-Tut

Fantastic Four #153 (1974) Rich Buckler

Fantastic Four #19 (1963) Jack Kirby

Hmmm, could Mahkizmo be the missing link in that Doom/Rama-Tut/Kang/Immortus chain? ;)

Fantastic Four #152 (Pt 5) At the Mercy of Mahkizmo and Rama-Tut!

Fantastic Four #19 (1963) Jack Kirby

Fantastic Four #152 (1974) Rich Buckler