Star Trek Alternate Realities picture quiz

The Star Trek Alternate Realities boxset brings together a collection of episodes from across The Original Series, Next Generation, Deep Space Nine and Voyager. And to mark its release, we've put together a special Den Of Geek picture quiz!

Your goal here is twofold. Firstly, you need the name of the episode, and secondly, you need to work out what's covered up in the picture.

The best of luck - and if you can't figure it out, then click here for the answers!