Mister Hendorff was a male Human Starfleet officer who lived during the mid-23rd century. He served in the operations division aboard the USS Enterprise, under Captain James T. Kirk, as one of the ship's security officers.
In 2267, Hendorff was a member of a landing party that visited Gamma Trianguli VI. He was the first of Vaal's victims, killed by the poison thorns of a native plant, moments after arriving on the planet's surface. Kirk noted the death in his captain's log, then called up to the Enterprise to request that the body be beamed after they cleared the area. Scott acknowledged, adding that "It's a shame about Hendorff." (TOS: "The Apple")
According to the Star Trek Encyclopedia (4th ed., vol. 1, p. 333), Hendorff was an ensign. The reference work quotes Robert Justman, who had this to say about Hendorff, "He was killed because he wore a red shirt. He should have known better!" In fact, he is the first of four redshirts to be killed in "The Apple".
Star Trek: Ongoing, from IDW Publishing, first revealed that the character known as "Cupcake" in the 2009 film was Hendorff's alternate reality-counterpart; this was later confirmed in canon in Star Trek Into Darkness. In issue #13, "The Redshirt's Tale", Hendorff survives the alternate reality's version of "The Apple" after receiving a blood transfusion from Spock, who is immune to the plant's poison. His first name initials are revealed to be "G. P."