The never-seen cook of Enterprise NX-01, constantly mentioned by the crew, whose role William Riker takes in a holodeck recreation of the ship's final mission.
Chef is a running reference throughout Star Trek: Enterprise. He prepares the meals in the captain's mess, bakes for birthdays, complains about raids on his stores and is often said to know more about the crew's troubles than anyone, yet he is never shown and never named.
In Silent Enemy his galley is asked to produce Reed's favourite dish, and in Singularity Hoshi Sato takes over the galley while he is unwell and becomes fixated on perfecting a family recipe.
The joke is paid off in the final episode, These Are the Voyages. Commander Riker, using a holodeck programme of Enterprise in 2161 to help him with a decision of his own, plays the part of Chef so that crew members will open up to him while he cooks.