ENT: The Crossing

The Enterprise is pursued by a craft many time larger than it is. The craft opens a large cargo door and essentially swallows Enterprise. Archer, Trip and Reed leave the ship to explore the alien ship, and discover strange wispy life forms that do not register on their tricorders. One of the wisps enters Trips head, and he recounts re-experiencing a moment on Earth. Back on the Enterprise, the wisp re-enters him and tries some Earth cuisine. The being informs Archer that they used to be corporeal too, but having evolved beyond that eons ago, they wanted to re-experience it. At ho9s request, the being leaves Trip and sets Enterprise free. However, it soon becomes apparent that the beings were not all they seem, and extreme measures will be taken to save the crew from alien possession.