Fantastic Four #144 (Pt 27) Krrak!

1966: Fantastic Four #56  Jack Kirby

1974: Fantastic Four #144  Buckler

Fun fact: Both KRRAK!s were lettered by artful Artie Simek. 

Next up: the estimable Giant-Size Super-Stars #1, published in February 1974.  I think you'll be surprised by several of the source panels, especially the ones involving the mighty Thundra. 

If you're still jonesing for more FF #144, click here.