The starship that docked and boarded Enterprise NX-01 in 2152 had three impulse engines on its back, and two nacelles coming out of its front. A roll bar also protruded from its top, as well as what appears to be two Bussard collectors. It was much smaller than Enterprise, and the Enterprise crew far outnumbered them. (ENT: "The Catwalk") No physical description of this craft was written in the final draft script of "The Catwalk".