Castaways - [s6e15]

The request likely refers to the episode " Castaways " (Season 6, Episode 15) , which is widely considered one of the series' most significant "bottle episodes".

“It's arguably the best episode of the entire show which is awkward given the title character is not only not in it but is barely even mentioned.” Reddit · r/dawsonscreek · 6 months ago

Fans often view this as a standout moment in the show's final season: