The Enterprise stops alongside a derelict alien craft, but the crew’s seemingly fruitless exploration of the ship has allowed alien visitors to stow away on the Enterprise herself. The vaporous life forms inhabit Trip first in a process they call the crossing, and introduce themselves to Captain Archer as fellow explorers. But as more of the gaseous beings take over the bodies of Enterprise crewmembers, Archer decides that the aliens’ explorations of his crew must come to an end. Soon, however, so many of the crew are taken over that the uncompromised officers take shelter in one of the warp nacelle catwalks – one of only a very few places inpenetrable by the beings in their ethereal form. Anyone risking a journey into the rest of the ship to stop the aliens is likely to be taken over themselves, leaving the crew with only one hope – Dr. Phlox, immune to the visitors’ crossing.
Guest Cast: Joseph Will (Rostov), Steven Allerick (Ensign Cook), Alexander Chance (Crewman #1), Matthew Kaminsky (Crewman #2)
LogBook entry by Earl Green