The Borgified Corpse wrote:
Niles on Frasier. Season 1 was very much Frasier's show. But from Season 2 onwards, it was more Frasier & Niles as a double act. This became more pronounced as the series went on. There are some later episodes where we spend more time in Niles' apartment than in Frasier's apartment. There are some episodes ("Moon Dance," "Head Game") where Frasier hardly appears at all and the episode is entirely about Niles.
To be entirely fair, however, many of these episodes coincided with Kelsey Grammer being in rehab / jail / having extended appearances in court / etc.