: The critically acclaimed pacing of this hour is noted for shifting the conflict from external terrorists to a direct confrontation with the White House.

: Season 5, Episode 21, "The Weight of the World," aired around the same era of peak network TV and is often cited in cross-show watching guides .

If you are following a specific watch order for similar shows of that era, enthusiasts often group these episodes:

If you were looking for a different series with the label "5x21," other notable episodes include: