Arne Darvin Arne Darvin was a male Klingon intelligence officer of the 23rd century Klingon Empire who assumed a human identity . Later , he suffered discommendation and assumed the identity of Barry Waddle , a Human merchant into the 24th century . History . As an operative for Klingon Intelligence , he was surgically altered to appear Human . He attempted to infiltrate the Federation ' s authorities on agriculture during the 2260s , posing as an assistant to Nilz Baris , the Federation Undersecretary for Agriculture In 2268 , on Deep Space Station K - 7 Darvin poison ed a shipment of quadrotriticale grain , which was destined for Sherman ' s Planet . Shortly after , Darvin ' s true identity as a Klingon was exposed by Captain James T . Kirk , using a tribble . ( ) After being disgraced , Darvin suffered discommendation and wandered from place to place as Barry Waddle . During the 2370s , he went to Cardassia Prime and became trapped there during the Klingon - Cardassian War . While on Cardassia , Darvin learned of the Orb of Time , which was on the planet at the time , and plotted to use it to change his past and gain revenge on Kirk . His opportunity came when the was assigned to transport the Orb back to Bajor in 2373 . As Waddle , Darvin gained passage aboard the " Defiant " and used the Orb of Time to transport the entire ship back to 2268 , where he planted a tricobalt bomb inside a tribble in the storage compartments aboard K - 7 . The crew of the " Defiant " successfully prevented the bomb from killing Kirk , minimizing the changes in the timeline . Darvin was captured and returned to Federation custody as well as his past self getting caught again . ( ) Background information . Arne Darvin was played by Charlie Brill . Though the " Defiant " crew continually referred to him as " Arne Darvin " , this name is most likely a pseudonym , and not his real name ( since Klingons do not generally have first and last names ) . It is clearly established that he " was " surgically altered to appear Human . Apocrypha . The comic " Beneath the Skin " established that the real Arne Darvin was in fact a Human who was killed by the Klingon Intelligence operative originally named " Gralmek " . ( The Klingon ' s orders had been to stab the real Darvin in the back , but Gralmek insisted on facing his counterpart openly — reasoning that a man has the right to know his killer . ) Gralmek was a Klingon with ridges , however he was a " mach ghoti " , a Klingon of diminutive stature and strength , which made him an ideal candidate for surgical alteration to appear Human . The comic also established that Gralmek was the first , and following his failed mission , last Klingon to undergo such alterations for the purposes of espionage . As well as back - story on Gralmek prior to becoming Darvin , the comic established that after the tribble incident Gralmek was held in Federation custody for several months before being returned to the Klingons in a prisoner exchange . Following this he was discommendated and expelled from Klingon space , which led to his desire to somehow get revenge on Kirk and redeem himself for the Klingon Empire . The novella " Honor in the Night " depicts an alternate universe where Arne Darvin successfully poisoned the quadrotriticale , which was eventually shipped to Sherman ' s Planet ; the resulting ecological disaster cost thousands of lives , which sickened him greatly . Ashamed at what he had done , he dedicated the rest of his life to restoring his honor and atoning for his crimes . In this story , Darvin ' s real name was " Krek " and he had always been a smooth - headed Klingon . Arne Darvin was a false identity and there was never a human with that name . In " " , the real Arne Darvin was a human who was traveling to Earth to begin training in the Federation Diplomatic Corps . He was beamed off his ship by a cloaked bird - of - prey and replaced by a surgically altered Klingon agent named " Kron " . The real Darvin was executed immediately afterwards .