Interesting to note that S6 had the most everyone-centric episodes of the series.
S1 had 5 (both parts of the Pilot, all three parts of Exodus)
S2 had none
S3 had none
S4 had 3 (all three parts of Theres No Place Like Home)
S5 had 5 (because You Left, Namaste, Follow The Leader, both parts of The Incident)
S6 had 6 (both parts of LA X, The Last Recruit, What They Died For, both parts of The End)
S1 had 5 (both parts of the Pilot, all three parts of Exodus)
S2 had none
S3 had none
S4 had 3 (all three parts of Theres No Place Like Home)
S5 had 5 (because You Left, Namaste, Follow The Leader, both parts of The Incident)
S6 had 6 (both parts of LA X, The Last Recruit, What They Died For, both parts of The End)