The Sehlat Who Ate Its Tail

The USS Farragut is attacked by a large scavenger ship and much of the crew is injured, including Captain V'Rel. The Enterprise arrives to help, with Spock, Chapel, Scotty, and communications officer Nyota Uhura joining acting captain James T. Kirk as his temporary command crew. The Enterprise is captured by the scavengers and the Farragut pursues them. The scavenger ship begins draining the Enterprise power and cuts off communications; the crew use wired phones from the 20th century and manual controls to get around this, while Pike and La'An disconnect them from the scavenger ship and kill some of the scavengers. Kirk struggles with the pressure of command, but with support from the others he devises a plan to trick the scavengers into temporarily disabling their own ship. As the Enterprise escapes, the Farragut fires into the scavenger ship and destroys it.

Summary from Wikipedia, CC BY-SA 4.0.