I know some people still don't what this means. No point in starting a new thread to explain this, as the thread name is perfect and is the top result in search engines. It took me a while to figure this out until I saw the name of the mission in my log.
So here goes for the explanation:
"Nukara Prime: Trasndimensional Tactics" is a PVE ground mission. Choose it, and then one of the guys will have to jump on the platform (located straight ahead). Click on the button, and you then "summon" the Tholian project leader.
This mission shouldn't be too hard to locate in your PVE queues, as there are only two exclusive Nukara Prime marks missions as of this date (well, for a long while anyhow).
The problem is they used to be done just by walking into caves on Nukara Prime. You had to form a team yourself and then go in. This was unwieldy, so they moved to be queues, but there's a bug that makes the mission still appear on your screen when you're on Nukara Prime.