In the episode "Rascals", Ro, Picard, Guinan and Keiko O'Brien (Rosalind Chao) are transformed into adolescent versions of themselves while retaining their adult intelligence. As children, they foil a Ferengi plot to steal the "Enterprise" and sell the crew as slave labor. In her final episode, "Preemptive Strike", Ro returns to the "Enterprise" as a Lieutenant after spending a year at Starfleet Advanced Tactical Training. During the course of the training, her commanding officer, Lieutenant Commander Chakotay, resigned from Starfleet to join the Maquis when his father is killed by the Cardassians. She is asked by Starfleet to infiltrate the rebel Maquis, who are undermining the Federation treaty with Cardassia. During the mission, she finds her loyalties in conflict with her duties as she becomes increasingly sympathetic to the plight of the Maquis. Despite Picard's effort to force her to do her duty, she joins the rebel group. Riker says she seemed pretty sure she was doing the right thing, though she regretted disappointing Picard. This is her last appearance in the Star Trek series; her subsequent fate is unknown.