most are probably going to say hush, because that it just one of the best episodes ever of any show out there. every element is there, and the fact that there was no dialogue for a major portion of the episode is amazing. but my favorite episode (so of course im going to think it's the best) of season 4, and also of the whole series, is "restless." everything about it is just perfectly put together. as a dream episode, it really has that dreamlike-ness to it, and pretty much everything used in the episode means something, or is representative of something important. it great how things like that work-- like the dialogue used, or the sets and the colors used, or specific costumes, y'know, just everything, it's kinda hard to convey how awesome i think this episode is. and the camera work & cinamatography done in the episode, uh, don't even get me started. this episode is what made me study TV/film at college, and want to work as an editor/camera operater person. there are just so many awesome looking shots throughout the ep.
also, it was a nice change as a season finale, since season 2 & 3 had both been 2-part season finales with huge battle scenes. it was cool for this episode to be about the core scoobs and touching base with each of them, delving into each of their psyches and understanding what each of them have been through these past 4 years, their relationships to one another, their fears, hope & dreams. plus some foreshadowing for future seasons. it's just all really cool!