Elaine Johnson is one of the last two survivors of the Gamma Hydra IV expedition in The Deadly Years, a woman of twenty-seven reduced to extreme old age by radiation sickness.
Elaine Johnson is a member of the research expedition on Gamma Hydra IV in the Original Series episode The Deadly Years. She and her husband Robert are the only members of the party still alive when the Enterprise landing party beams down.
Although she is only twenty-seven, Elaine has the body and mind of a very old woman. The landing party also finds the remains of a colleague, Alvin, who has died of apparent old age.
Elaine and Robert are brought to the Enterprise sickbay, but nothing can be done for them and they die within a short time. The same illness soon appears in most of the landing party, and only Chekov, who had a bad fright on the planet, escapes it, a clue that leads McCoy to adrenaline as the basis of a cure.