well, in Balance of Terror it was a major thing that Romulans and Vulcans were basically the same, should\'ve been a little "woah, a bald Vulcan, wtf?"
They are, but they are inert until mixed in the core, which is one big mutha and seen in just about every movie and every series. It\'s basically the defacto power source in Star Trek. Although Romulans are a little different, they use a forced quantum singularity to power their ships. There was a TNG episode about the problems caused by those.
The very first episode of Star Trek had no Kirk but a Captain Pike commanding the ship. They met the telepathic Talosians. Later in the original series after Pike was basically crippled after an heroic rescue Spock tried to take him back to the Talosions because they could use their telepathic powers to create the illusion of him being healthy and whatnot. However going to the Talosian homeworld was a capitol offense.
Since Pike only commanded the ship for about an hour or so, the very first Star Trek story never happened.
Spocks future ship, the spinning thing. It\'s called the Jellyfish and was designed by none other than Geordi LaForge. It\'s in the prequel comics.