Addison visits Seattle Grace because they need skills that only she has. Rebecca/Ava returns with news for Alex. Meredith and Derek's clinical trial experiences one or two developments.
Grey's Anatomy — Season 4 Episodes (17)
EP 1
E1
EP 2
E2
EP 3
E3
EP 4
E4
EP 5
E5
EP 6
E6
EP 7
E7
EP 8
E8
EP 9
E9
EP 10
E10
EP 11
E11
EP 12
E12
EP 13
E13
EP 14
E14
EP 15
E15
EP 16
E16
EP 17
E17
Other Seasons
Season 1 · 9 epSeason 2 · 27 epSeason 3 · 25 epSeason 5 · 24 epSeason 6 · 24 epSeason 7 · 22 epSeason 8 · 24 epSeason 9 · 24 epSeason 10 · 24 epSeason 11 · 25 epSeason 12 · 24 epSeason 13 · 24 epSeason 14 · 24 epSeason 15 · 25 epSeason 16 · 21 epSeason 17 · 17 epSeason 18 · 20 epSeason 19 · 20 epSeason 20 · 10 epSeason 21 · 18 epSeason 22 · 18 ep
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