A Starfleet supply ship that the Enterprise-D is due to meet in 2369; arriving early for the rendezvous gives the crew the free time in which the holodeck western goes wrong.
The USS Biko is the reason for the idle hours in the Next Generation episode A Fistful of Datas. The Enterprise reaches the rendezvous point well ahead of the supply ship, and Picard lets the crew spend the wait on personal projects.
Worf reluctantly joins his son Alexander and Deanna Troi in a holodeck programme set in the Old West town of Deadwood, while La Forge and Data try out a scheme to use Data as a backup for the ship's computer. That experiment spills Data's memory into the holodeck and fills the town with gunslingers who share his face and his reflexes.
Once the fault is cleared the Enterprise goes on to meet the Biko as planned. The ship is named after the South African activist Steve Biko.