Sub-Mariner #65, Page #1 Splash (Heck/Romita/Perlin) (1973)

September 1973, Sub-Mariner #65, Page #1 Splash, Don Heck pencils/Don Perlin inks, (John Romita re-drew the face of the Sub-Mariner), "The Cry of the She-Beast",
A great splash of the Monarch of the Seas, The Mighty Sub-Mariner, humbled in chains.

Don Heck's short run of drawing Sub-Mariner began in issue #64 (which was the issue that the late, great Steve Gerber also began writing) and ended with issue #68, only 5 issues.
Sub-Mariner #65 introduces the "She-Beast", a female warrior stronger than ever the mighty Sub-Mariner! The story continued into issue #66.