overview General Star Trek: Enterprise follows the adventures of the crew of the first starship Enterprise, designation NX-01. They are the first deep space explorers in Starfleet, using the first warp-five-capable vessel. The Vulcans have withheld advanced technology from humanity since their first contact, concerned that humans were not ready for it. This has delayed human space exploration and caused resentment in Starfleet test pilot Jonathan Archer, whose father developed the Warp 5 engine but did not live to see it used. The Enterprise was intentionally equipped with less-advanced technologies than those seen in previous series (which occurred later on the Star Trek timeline). It had no tractor beam, but utilized grappler cables; and used missiles instead of particle weapons (see Weapons in Star Trek); in Season 1, phase cannons were added, similar to those on the Enterprise in The Original Series. It had only limited means of synthesizing foods and other consumable items. Communications Officer Linguist Hoshi Sato's expertise in linguistics helps compensate for the lack of the advanced universal translator. The series also showed the crew making first contacts with a number of races previously seen in the franchise. The Klingon, who appear in the pilot "Broken Bow", have the ridged makeup seen in the movie franchise and from Star Trek: The Next Generation onwards (excluding Star Trek: Discovery), rather than the smooth-headed versions seen in Star Trek: The Original Series. Berman and Braga attributed this change to advancements in makeup, and felt that such contradictions in continuity were unavoidable. The change in the Klingons' appearance was eventually justified by attributing it to a plague caused by genetic experimentation. Electronics in Enterprise were also more compact than those of previous (future) series, as advances in real-world technology made devices seen in The Original Series and Voyager seem anachronistically oversized. The series's first season emphasized a core trio of characters: Jonathan Archer, T'Pol, and Trip Tucker. Other main characters had primary roles in particular episodes, such as "Dear Doctor" and "Fight or Flight". The second season saw deepening relationships between characters—for example, the friendship between Tucker and Reed, seen in episodes such as "Two Days and Two Nights"; and the relationship between Tucker and T'Pol, which begins contentiously but leads to romance in later seasons. Temporal Cold War The addition of a futuristic Temporal Cold War element was seen as a "nod to mystery" by Rick Berman, who sought