Warlord Krang and Dorcas used Orka and a fleet of killer whales to attack Atlantis, but were thwarted by Namor and interference by Tiger Shark.

Namor captured Dorcas and Warlord Krang, who revealed Byrrah's involvement in the plot, thus ruining his bid for power.

[5] Namor regained his freedom with the help of the Hydro-Men and attacked the conspirators, throwing Tiger Shark into one of Attuma's war machines.

Upon setting up a base in Tetiaroa Atoll, Doctor Dorcas mutated several creatures to serve him and kept them under his control with neuroleeches.

[9] Upon resurfacing following his apparent death, Dorcas mutated himself with starfish tissue, which allows him to breathe underwater or regrow lost limbs.

During the "Ultimatum" storyline, the Thing, Invisible Woman, and Dr. Arthur Molekevic fight Doctor Dorcas alongside Namora and Tiger Shark in Atlantis and defeat him.