In 2371, Tuvok was assigned to infiltrate the Maquis organization aboard Chakotay's vessel. In the last season, episode four, "", introduced the premise that during the infiltration mission, Tuvok's identity was uncovered by a Maquis counter-intelligence agent, Teero Anaydis (Keith Szarabajka), who used Tuvok as a laboratory specimen for mind-control experiments. Although Tuvok was conscious throughout the experiments, Teero wiped his memory when he had finished, ensuring that Tuvok was unable to remember any details. Following the ordeal, Tuvok was released back among the Maquis. This "time-bomb" was activated by a message hidden in a letter from Tuvok's son that caused the events seven years later in the "Voyager" timeline.