Star Trek: Enterprise (ENT) focuses on the 22nd century adventures of Captain Jonathan Archer aboard the Enterprise NX-01 during the early days of interstellar travel. The NX designation indicates that this Enterprise is an experimental prototype; Unlike the starships of the four other Star Trek series, this Enterprise doesn't have deflector shields or phasers, but it does come equipped with a phase cannon and a rudimentary transporter that functions efficiently most of the time.