A young Enterprise officer promoted to lieutenant in 2259 just before joining the landing party to the wrecked USS Peregrine, where he is killed by a newly hatched Gorn.
Duke appears in the first-season Strange New Worlds episode All Those Who Wander. At the start of the episode Pike hosts a gathering in his quarters to mark several departures and advancements, and Duke is congratulated on his promotion from ensign to lieutenant.
He is then assigned to the party that takes shuttles down to the frozen planet Valeo Beta V in search of the Peregrine, a Starfleet ship that has crash-landed there. The team find the crew dead and only a few survivors, one of whom is carrying Gorn eggs.
Once the hatchlings are loose in the wreck they hunt the landing party through its corridors. Duke is ambushed and killed by one of them, among the first of the losses in an episode that ends with the death of Hemmer.