Sub-Mariner #23 Mar 1970
First appearance of Orka in "The Coming of Orka"
Returning to his undersea realm, Namor comes across a large herd
of killer whales, led by the monstrous Orka, and takes him on;
Namor is defeated by Orka, but follows him and discovers that Dr. Dorcas and Krang
are actually behind Orka's powers,
and are planning an attack on Atlantis;
Namor gains the upper hand by threatening Krang's life which prompts Orka to turn against Dorcas;
However, Namor's plan comes undone and he's taken down hard by Orka;
Following Krang's orders, Orka puts a stun-collar and chains on the Sub-Mariner;
Krang then announces an intention of marching into Atlantis with an enslaved Namor.
Script by Roy Thomas,
pencils by Marie Severin,
inks by Johnny Craig