The brother-and-sister duo played by Kerr Smith and Meredith Monroe moved to Capeside in Season 2 and immediately shook up the show’s romantic storylines.

During the course of their relationship, Andie helped show off a new, tender side of Pacey, while Jack drove a wedge between Dawson and Joey before coming out in one of the series’ most significant storylines.

Monroe’s character was eventually written out in Season 4, but Jack remained an integral part of the group, especially as Jen’s BFF, to the very end.

https://tvline.com/lists/best-tv-characters-late-cast-additions-seinfeld-buffy-the-office/best-tv-characters-late-cast-additions-jack-andie-mcphee-dawsons-creek/