TNG introduces us to the holodeck here. It had been seen before in this series and in the animated Star Trek, but this is the first episode devoted completely to it (and the first with the "newly upgraded" holodeck with fully interactive modes instead of static backgrounds), and as such it lays the groundwork for many future episodes. The episode itself is a breath of fresh air for the first season, with new sets and a different sort of cinematic style (think "Maltese Falcon"). Unfortunately, the story begins to drag towards the end as (once again) there's too little story to fill the hour and everyone ends up doing a lot of talking as the episode nears the close.
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