i just finished the entire show a week ago but this question popped up when i started watching s5 e1

i mean.. isnt he supposed to be happy instead? he knew jack has finally gave up in hope of finding a time portal so why was he sad

I know a few folks considering watching because I keep talking about the show, but are wary because they think the show as a whole might be pretty different from the show I make it sound like. (And they're right. I won't shut up about Scaramouche.) So I'd like to be able to say "Just watch episode [XYZ] and if you're interested, you might like the whole show."

Note that the point here is to help someone decide IF they want to see it, not to CONVINCE them to see it. If you wanted to CONVINCE them to see it, you'd probably show them one of the best episodes—but if they only watched the show on the basis of the very best, the rest of the show would be inferior in comparison, right?

So, instead, what would you show them if your goal was "if you enjoyed this, then you'd probably enjoy the rest of the series too"?