The Cage Arc
Aside from a strong premiere (and also J.J. Abrams' last official contribution to the series), this was not what we expected from our first extended visit with The Others. The six-episode arc on Hydra Island hit the same beats over and over again: Ben does something manipulative. Jack rages. Sawyer and Kate make eyes—and eventually sex. They break rocks all day (what?). Juliet acts mysterious.
And over and over again, in the same mechanic routine as winning a fish biscuit. Sadly, this wasn't even the lowest of low points for season three.