Unexpected

As Archer and the gang head through space, things seem screwed up on the Enterprise. It seems that a cloaked ship is tailgating them and drawing power from them. The aliens seem to be benevolent enough but need work on their engines. Trip is chosen to go over there on a shuttle (transportation is in its earliest stages) and needs to go through a kind of decompression (like a deep sea diver) that takes three hours. Once on board he needs to rest and then hooks up with an interesting female alien engineer. There is a little spark between them (mostly some flirting), but when Trip gets back to the Enterprise, some interesting things begin happening. This is also the first encounter with Klingon warriors. Quite a good offering from a greatly underrated series.