An unmanned Federation ore freighter that wandered into the M-5 war games in 2268 and was destroyed by the Enterprise while the experimental computer was in control.
The Woden is an old-style ore freighter converted to run under automation with no crew aboard. It appears in the episode The Ultimate Computer, set in 2268.
The Enterprise is testing Richard Daystrom's M-5 multitronic unit, which has been given control of the ship for a series of exercises. When the slow, harmless Woden crosses the Enterprise's path, the M-5 treats it as a threat, locks on photon torpedoes and blows it apart before Kirk can stop it.
The pointless attack is the first clear sign that the M-5 cannot be trusted. Kirk orders it disconnected, but the computer protects itself and goes on to attack real starships.