Episode Ratings Grid

Every episode at a glance, color-coded by rating. Rows are episode numbers within each season, columns are seasons.

M
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
S23
S24
S25
S26
S27
S28
S29
S30
S31
S32
S33
S34
S35
S36
S37
S38
S39
S40
S41
S42
S43
S44
S45 1-30
S45 31-60
S45 61-90
S45 91-106
S46 1-30
S46 31-60
S46 61-90
S46 91-101
S47
S48 1-30
S48 31-60
S48 61-90
S48 91-101
S49 1-30
S49 31-60
S49 61-90
S49 91-101
S50
S51
S52
E1
7.9
6.7
?
7.9
7.6
?
?
?
?
?
6.8
8.0
8.0
7.2
8.2
?
?
8.6
?
?
8.0
?
?
8.1
8.6
7.1
8.0
?
7.1
6.7
7.8
7.7
7.4
?
8.0
7.7
7.1
7.1
6.9
7.5
7.3
7.9
7.4
7.4
8.0
7.8
8.4
7.6
7.9
7.5
7.6
6.9
E2
7.9
?
?
8.1
?
?
8.1
?
8.0
8.4
?
?
7.8
9.0
7.9
8.2
?
8.0
7.6
?
7.9
7.5
7.9
8.4
7.8
8.0
8.2
7.9
7.8
7.4
6.5
7.7
?
8.1
8.1
7.1
6.9
8.1
7.4
7.5
8.0
7.8
7.5
7.8
7.2
7.8
7.9
7.3
6.7
6.6
7.2
6.9
E3
7.8
?
?
?
7.8
?
?
?
?
?
7.8
?
?
8.3
8.2
8.2
8.0
8.2
?
8.2
8.0
6.3
8.1
7.4
8.0
?
7.5
8.3
6.1
6.9
7.5
8.2
7.1
8.4
7.6
7.8
6.9
7.9
7.8
7.4
6.5
7.4
7.4
7.3
7.2
7.8
8.1
7.7
7.9
7.6
7.9
7.8
E4
7.9
?
7.6
7.6
8.2
?
?
9.0
?
7.4
?
?
8.0
?
?
7.6
?
8.1
?
?
?
8.3
8.4
7.8
?
8.5
?
7.4
7.3
8.3
7.0
?
7.6
8.4
7.7
7.4
7.5
8.0
7.5
6.6
7.3
7.5
7.4
7.4
7.4
7.5
7.6
7.4
7.9
7.3
8.0
7.1
E5
6.7
?
?
7.2
?
?
?
7.8
?
?
7.0
?
7.7
7.3
?
?
?
7.8
7.4
8.1
?
?
8.0
8.1
8.6
8.5
8.0
7.1
7.6
7.5
8.1
8.2
7.8
6.7
8.1
7.7
7.3
7.6
7.0
6.9
6.9
7.6
7.6
8.0
7.0
7.9
8.1
7.2
6.7
7.7
7.6
7.0
E6
7.6
?
?
?
?
?
?
?
?
8.0
?
7.8
?
?
?
?
7.2
8.1
?
?
7.4
7.3
7.8
8.5
7.6
8.0
7.4
?
8.7
6.7
8.1
7.5
7.6
7.8
7.7
7.9
7.6
8.3
7.5
8.3
8.2
7.5
7.5
7.1
8.1
7.6
7.6
7.5
7.8
7.3
7.6
7.6
E7
8.0
?
?
?
?
?
?
?
?
7.8
?
?
?
9.0
7.6
7.2
7.8
7.8
?
?
7.3
6.9
8.2
6.8
?
8.0
6.6
?
7.5
8.0
7.6
8.0
7.8
7.0
7.8
8.5
8.0
7.3
7.5
6.1
6.1
7.6
7.5
7.1
7.7
7.9
7.8
7.2
8.1
?
7.0
7.1
E8
?
7.7
8.5
?
7.5
?
?
7.9
?
?
?
8.5
?
?
?
?
?
?
?
?
7.3
7.3
?
8.3
7.8
?
8.0
?
7.7
?
8.0
8.2
8.4
?
7.4
7.3
7.6
7.3
7.8
7.6
8.0
8.1
6.6
7.6
7.8
7.6
8.0
6.2
7.6
6.8
7.7
7.3
E9
?
8.0
?
?
7.2
7.8
?
7.6
7.8
7.8
?
?
?
?
7.9
7.2
?
?
8.2
?
?
7.4
?
?
8.4
?
7.9
7.3
7.7
8.3
7.8
?
7.4
7.8
7.7
7.2
7.7
6.9
8.3
7.8
7.8
6.9
7.0
7.9
7.8
8.1
7.5
7.0
7.0
7.2
5.8
E10
7.5
7.8
?
?
?
?
7.9
6.8
?
?
?
?
?
?
6.2
?
7.9
?
8.0
?
8.0
7.0
?
7.7
?
8.4
7.4
8.0
6.7
7.7
7.3
?
6.9
7.0
6.9
7.0
7.2
7.0
6.8
7.8
7.4
7.3
7.1
7.9
7.4
7.1
8.2
7.4
8.2
7.8
7.0
7.2
E11
?
8.5
?
?
?
?
8.4
?
7.9
?
?
8.6
?
8.2
?
7.4
7.7
?
?
?
?
8.4
7.7
8.2
7.4
7.6
7.2
7.6
8.1
7.2
7.9
8.4
8.0
?
7.1
7.3
7.0
7.1
7.5
7.6
6.1
7.9
7.8
7.5
6.9
?
8.0
8.4
8.1
7.0
7.1
7.1
6.6
8.1
7.4
7.4
E12
?
?
?
?
?
8.8
?
?
?
7.7
?
?
7.6
7.0
8.8
?
7.9
8.8
8.1
8.2
7.6
7.6
?
8.1
7.6
6.8
7.5
7.0
7.3
7.7
7.6
7.7
5.9
?
7.4
7.8
7.2
7.0
7.3
7.7
7.4
7.4
7.6
7.5
7.8
8.9
8.2
8.3
8.1
7.4
8.2
7.7
7.2
E13
7.6
?
?
?
?
?
?
8.6
?
?
8.1
7.7
7.6
7.2
8.8
7.8
?
8.5
?
?
?
?
?
?
7.8
7.4
?
7.7
8.0
7.8
7.9
8.1
7.5
7.8
7.7
7.9
7.3
8.0
7.2
7.7
8.0
7.8
7.6
7.2
7.8
7.7
8.2
7.6
7.1
7.3
8.1
7.7
7.5
E14
7.4
?
7.7
?
?
8.1
?
?
8.0
?
?
?
?
8.8
?
7.7
7.9
?
?
?
8.4
7.8
8.6
?
7.8
7.8
7.6
7.5
7.0
8.1
?
7.9
7.8
7.9
7.8
7.5
7.3
6.3
7.0
7.3
6.6
7.2
7.4
8.0
8.5
7.9
7.8
7.2
7.2
7.6
7.5
E15
?
?
?
?
?
?
?
?
?
?
7.4
?
?
8.8
?
8.1
7.5
7.7
8.6
?
8.0
8.4
7.6
7.4
8.0
7.5
7.2
7.2
7.4
7.8
8.1
8.1
6.2
7.3
8.0
7.1
7.2
7.4
6.9
7.4
6.3
6.8
7.6
7.2
7.7
8.5
7.5
7.2
8.5
7.5
7.6
8.0
E16
8.0
?
?
?
?
?
?
?
?
?
?
7.6
8.3
8.2
6.8
?
?
7.6
?
7.6
7.2
7.0
8.1
?
6.8
6.9
8.4
7.7
8.1
7.5
8.0
7.3
7.6
7.1
6.7
8.4
7.4
7.0
7.5
7.3
8.0
7.6
8.3
7.7
8.5
7.6
7.2
7.3
7.4
8.0
7.7
E17
?
?
8.0
?
7.8
8.5
?
?
7.8
?
7.9
7.2
?
?
?
?
7.8
7.8
8.1
?
7.3
7.8
8.1
?
?
7.8
7.4
6.7
8.2
7.7
7.1
8.5
8.0
8.1
7.1
8.3
6.6
6.7
6.8
7.8
7.3
8.4
7.8
7.2
6.7
7.7
7.7
6.8
E18
7.2
?
7.6
?
?
?
?
8.0
?
?
?
?
8.6
8.2
8.0
?
7.4
?
7.7
7.8
7.3
?
?
7.9
8.2
7.3
7.7
6.3
7.1
7.2
8.4
7.8
6.5
7.7
7.8
7.6
8.0
8.0
7.2
6.6
6.4
7.7
E19
?
?
8.0
?
7.8
8.0
?
?
8.2
?
?
7.8
7.1
?
?
?
?
7.9
7.0
8.3
7.7
8.4
8.0
6.4
7.7
?
7.0
7.3
8.3
7.8
7.3
7.6
8.0
7.6
7.7
7.8
7.9
7.2
7.9
E20
7.8
?
?
8.4
?
?
?
8.6
7.8
?
7.6
?
?
?
8.2
5.5
7.6
?
7.3
8.2
7.8
7.4
7.5
7.7
8.4
7.4
7.8
6.4
7.7
E21
?
7.6
8.2
?
8.0
6.2
7.6
7.5
7.5
7.9
8.1
7.9
8.0
7.6
E22
?
?
6.9
7.2
7.4
7.6
E23
7.3
7.7
7.9
7.7
E24
7.4
7.3
E25
7.5
E26
E27
E28
E29
E30
Avg
7.7
7.7
7.8
7.8
7.7
8.1
8.2
8.0
7.9
7.9
7.6
8.1
7.7
8.0
8.0
7.7
7.8
8.1
7.8
8.2
7.7
7.4
7.8
8.0
7.9
7.8
7.5
7.7
7.5
7.4
7.7
7.9
7.5
7.5
7.6
7.7
7.3
7.7
7.3
7.3
7.3
7.5
7.4
7.5
7.7
7.9
7.9
7.4
7.4
7.4
7.4
7.3
Excellent
Great
Good
Mid
Bad
SeriesScores.com

Episode Power Rankings

The best and worst episodes at a glance. Use this to find must-watch episodes or ones you might want to skip.

🏆 Top Episodes

#1 9.0

S8E4 Anatomy of a Volcano

When Mount St. Helens erupted earlier this year, it focused the attention of the whole world on the almost incredible destructive forces that volcanos can release. Geologists from around the world congregated at the volcano and NOVA joined the vigil for an in-depth look at the incident and its aftermath.

#2
S14E2 9.0

Children of Eve

NOVA examines a controversial theory that traces our ancestry to a small group of women living in Africa 300,000 years ago.

#3
S14E7 9.0

Confessions of a Weaponeer

Harvard chemist George Kistiakowsky was an anti-Bolshevik soldier in 1919 Russia, an atomic bomb scientist at Los Alamos, a presidential advisor in the Eisenhower White House and an arms control activist. Shortly before Kistiakowsky death, he recounts his eventful career to interviewer Carl Sagan.

  1. 4. S45E102 "NOVA Wonders: What's Living in You?" 8.9
  2. 5. S6E12 "Life on a Silken Thread" 8.8
  3. 6. S15E12 "Pioneers of Surgery: The Brutal Craft (1)" 8.8
  4. 7. S15E13 "Pioneers of Surgery: Into the Heart (2)" 8.8
  5. 8. S15E14 "Pioneers of Surgery: New Organs for Old (3)" 8.8
  6. 9. S15E15 "Pioneers of Surgery: Beyond the Knife (4)" 8.8
  7. 10. S18E12 "So You Want to Be a Doctor?" 8.8

📉 Bottom Episodes

#732
S22E20 5.5

Treasures of the Great Barrier Reef

  1. 731. S52E9 "Critical Condition: Health in Black America" 5.8
  2. 730. S33E12 "Building on Ground Zero" 5.9
  3. 729. S41E11 "Why Sharks Attack" 6.1
  4. 728. S41E7 "Wild Predator Invasion" 6.1
SeriesScores.com

The Quality Arc

Each point is an episode, plotted chronologically. The colored bands mark season boundaries. Look for upward or downward trends to see if quality improved or declined over time.

S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 S39 S40 S41 S42 S43 S44 S45 S46 S47 S48 S49 S50 S51 S52 55.96.87.78.69.5 Rating 102 204 306 408 510 612 714 816 918 1020 Episode 10 9 8 7 6 5
SeriesScores.com

Episode Engagement

Vote count shows how many people cared enough to rate. High votes + high rating = beloved classic. High votes + low rating = notorious stinker. Low votes + high rating = hidden gem.

Rating threshold:
227 Standouts
140 Infamous
257 Hidden Gems
108 Forgettable
Standouts Infamous Hidden Gems Forgettable Global: 7.5 5.56.26.97.68.39.0 Rating 6 22 79 288 1k Votes (log scale)
Top Standout: S45E1 Black Hole Apocalypse
Most Infamous: S40E7 Mind of a Rampage Killer
Best Hidden Gem: S8E4 Anatomy of a Volcano

Episodes plotted by rating vs. vote count. The vertical line marks the rating threshold (7.5). More votes = more engagement. Toggle above to compare against global or show-specific median.

SeriesScores.com

Series Trajectory

A simplified view: one point per season. This smooths out episode-to-episode noise to show the overall arc of the series.

6.577.588.59 Rating S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 S39 S40 S41 S42 S43 S44 S45 S46 S47 S48 S49 S50 S51 S52 Season 10 9 8 7 6 5
SeriesScores.com

Season Momentum

Did each season build momentum or fizzle out? Green arrows mean the finale rated higher than the premiere. Red means the opposite. Longer arrows = bigger swings.

5678910 Rating S1 7.9 7.5 -0.4 S2 7.2 7.7 +0.5 S3 7.6 7.8 +0.2 S4 8.0 7.8 -0.2 S5 7.7 7.8 +0.1 S6 7.8 7.8 0.0 S7 8.0 8.1 +0.1 S8 8.4 8.3 -0.1 S9 8.0 7.9 -0.1 S10 7.9 7.9 0.0 S11 6.8 8.2 +1.4 S12 7.9 8.3 +0.3 S13 7.9 7.7 -0.2 S14 8.3 8.2 -0.1 S15 8.2 7.6 -0.6 S16 8.2 8.1 -0.1 S17 7.6 8.1 +0.5 S18 8.2 7.8 -0.4 S19 7.5 7.6 +0.1 S20 8.1 8.0 -0.1 S21 8.0 7.7 -0.3 S22 7.4 7.0 -0.4 S23 8.1 7.6 -0.5 S24 7.9 8.1 +0.2 S25 8.0 7.8 -0.2 S26 8.0 7.8 -0.2 S27 8.0 7.4 -0.6 S28 7.9 7.7 -0.2 S29 7.1 7.5 +0.4 S30 7.2 7.2 +0.0 S31 7.3 7.9 +0.7 S32 7.7 7.7 0.0 S33 7.5 7.5 +0.0 S34 8.4 7.1 -1.3 S35 7.8 7.4 -0.4 S36 7.6 8.0 +0.4 S37 7.0 7.1 +0.1 S38 8.0 8.4 +0.4 S39 7.5 7.3 -0.1 S40 7.4 7.4 0.0 S41 7.3 7.4 +0.1 S42 7.6 7.6 0.0 S43 7.4 7.8 +0.4 S44 7.4 7.6 +0.2 S45 7.2 7.7 +0.5 S46 7.8 7.9 +0.1 S47 8.0 7.6 -0.4 S48 7.5 7.5 +0.1 S49 7.9 7.0 -1.0 S50 7.4 7.5 +0.0 S51 7.6 7.2 -0.4 S52 7.0 7.7 +0.7
SeriesScores.com

Season Consistency

Some seasons are reliable bangers. Others are hit-or-miss. Each dot is an episode. Tightly clustered dots mean consistent quality. Scattered dots mean a mixed bag.

5678910 Rating S1 Typical avg 7.7 S2 Uneven avg 7.7 S3 Uneven avg 7.8 S4 Typical avg 7.8 S5 Typical avg 7.7 S6 Typical avg 8.1 S7 Steady avg 8.2 S8 Uneven avg 8.0 S9 Rock Solid avg 7.9 S10 Steady avg 7.9 S11 Uneven avg 7.6 S12 Typical avg 8.1 S13 Steady avg 7.7 S14 Uneven avg 8.0 S15 Erratic avg 8.0 S16 Uneven avg 7.7 S17 Steady avg 7.8 S18 Typical avg 8.1 S19 Steady avg 7.8 S20 Steady avg 8.2 S21 Typical avg 7.7 S22 Erratic avg 7.4 S23 Typical avg 7.8 S24 Uneven avg 8.0 S25 Typical avg 7.9 S26 Uneven avg 7.8 S27 Uneven avg 7.5 S28 Typical avg 7.7 S29 Uneven avg 7.5 S30 Uneven avg 7.4 S31 Uneven avg 7.7 S32 Typical avg 7.9 S33 Uneven avg 7.5 S34 Uneven avg 7.5 S35 Typical avg 7.6 S36 Typical avg 7.7 S37 Typical avg 7.3 S38 Uneven avg 7.7 S39 Typical avg 7.3 S40 Uneven avg 7.3 S41 Uneven avg 7.3 S42 Typical avg 7.5 S43 Typical avg 7.4 S44 Typical avg 7.5 S45 Uneven avg 7.7 S46 Typical avg 7.9 S47 Steady avg 7.9 S48 Typical avg 7.4 S49 Uneven avg 7.5 S50 Uneven avg 7.4 S51 Uneven avg 7.4 S52 Uneven avg 7.3 Episode Premiere/Finale

Each dot is an episode. Clustered dots = consistent quality. Scattered dots = variable season. Hover for episode details.

SeriesScores.com