After brief appearances in titles the Hulk and Defenders respectively, Newell becomes a regular guest-star in the title "Marvel Two-In-One". The character moves his oceanographic facilities and research to Hydro-Base, an artificial island previously used by the insane ecologist Doctor Hydro (occupied by Dr. Henry Croft and the passengers of an airplane, who were captured by Hydro and changed into merfolk known as the Hydro-Men). As Stingray, Newell aids Fantastic Four member the Thing; Triton and heroine the Scarlet Witch against the villains the Serpent Squad and company Roxxon Oil to prevent them from obtaining the artifact the Serpent Crown. Stingray is present when Mister Fantastic cures Croft and the other passengers, and aids the Thing, and Inhumans Gorgon and Karnak against Maelstrom's Minions, who steal a dose of the healing compound.