Doctor Poison

Doctor Poison debuted in 1942 (Golden Age Wonder Woman continuity) as a masked chemical-weapons operative who was later revealed to be Princess Maru, a Japanese royal who headed poison divisions allied with Axis espionage and planned the 'Reverso' water-contamination plot against the United States Army. Across DC continuity reboots the identity has been reintroduced and reimagined: Post-Crisis versions include an unnamed doctor and a granddaughter of Maru with grotesque facial prosthetics; the New 52 presented a Russian scientist known as Dr. Maru; and Rebirth reformulated the character as Colonel Marina Maru, a Japanese–American mercenary who leads a team called 'Poison'. Each incarnation functions within its respective continuity as a human antagonist rather than a supernatural entity.

Appearance varies by continuity but uses recurring surgical/chemical-war motifs. The Golden Age Doctor Poison first appeared as an ostensibly male figure in a hooded green surgical gown and black domino mask and was unmasked as Princess Maru. The Post-Crisis incarnation deliberately presents a ghoulish, surgically altered face—molecularly bonded appliqués peeling back eyelids for a permanent stare and dental hooks pulling the lips into a rictus—while wearing a dark green leather trench and cowl echoing earlier surgical garb. The New 52 and Rebirth incarnations update nationality, role, and gear (New 52: a Russian scientist; Rebirth: Colonel Marina Maru leading a mercenary team), though detailed costume descriptions for those versions are not provided in the cited summaries.

Doctor Poison's documented capacities are scientific and organizational rather than supernatural: expertise in poisons, toxicology, and chemical/biological agent development; planning and execution of bioterror/contamination schemes (the Golden Age 'Reverso' water-contamination plot is a concrete example); leadership of poison divisions, espionage units, or mercenary teams; use of disguise (including assumed male presentation) to conceal identity and further operations; and collaboration with other antagonists to deploy larger threats (e.g., involvement in plots that resulted in the creation of the golem Genocide when allied with other villains). The sources emphasize that she is fundamentally a human scientist/operative whose danger derives from technology and tactics rather than innate supernatural power.