Star Trek: The Next Generation - Season 6 Episode 7 -

Captain Picard, Ensign Ro, Keiko and Guinan are returning to the Enterprise aboard a shuttlecraft when they encounter a deadly energy field. They are all safely beamed aboard the ship but are transformed in the process - their minds are unchanged but their bodies have resorted to those of 12 year-olds. Dr. Crusher finds that their DNA has been slightly altered but may be able to returns them to their normal selves. Meanwhile, the Enterprise is on a mission to rescue a large Federation science team but come under attack by a group of rogue Ferengi.