The Kovaalans controlled a nebula in the Expanse in which one terminus of a subspace corridor was located. In 2154, while attempting to utilize the corridor to reach a rendezvous with the Xindi-Primate Degra, the crew of Enterprise NX-01 were forced to combat the Kovaalans. With the help of their counterparts from a temporally-displaced version of Enterprise from an alternate timeline, the crew was able to successfully negotiate their way past the Kovaalans, and safely pass through the corridor. (ENT: "E²")