The invisible scout craft that carries Commissioner Bele of Cheron in his fifty-thousand-year pursuit of Lokai, disintegrating on a collision course with the Enterprise as it delivers him aboard.
Bele's ship features in the Original Series episode Let That Be Your Last Battlefield. Soon after the Enterprise recovers the fugitive Lokai from a shuttlecraft stolen from Starbase 4, sensors pick up a second vessel closing at great speed on a collision course, although nothing can be seen on the viewscreen.
At the last moment the craft breaks up, and its pilot, Bele, appears on the bridge. He describes it as a scout vessel whose sheathing rendered it invisible, and treats its loss as of no importance now that his quarry is within reach.
Because the ship is never shown, it is one of the few vessels in the series represented purely by sensor readings and dialogue. With it gone, Bele relies on his own mental powers to seize control of the Enterprise and force it towards Cheron.