Star Trek: Deep Space Nine: Season 6, Episode 14

6 - 14: One Little Ship

O'Brien, Dax, Dr. Bashir, and their runabout are reduced in size while investigating an anomaly. However, when the Jem'Hadar attack and commandeer the Defiant, the trio are left with no choice but to take their miniature runabout inside the Defiant to help Sisko and the others retake the ship.