Lost in Space Episode Ratings Heatmap
1965 · 3 Seasons · 83 Episodes · Overall Score: 5.7/10 (83 rated)
Season 1 holds the highest collective average score across the series.
Season 1 Details →Lowest score variance (σ = 0.62), maintaining an average of 6.1.
Complete Episode Rating Matrix
Interactive score chart by season and episode number. Darker green indicates higher ratings; amber and red denote lower reception.
| Episode | Season 1 | Season 2 | Season 3 |
|---|---|---|---|
| Ep 1 | 7.0 | 6.0 | 6.0 |
| Ep 2 | 6.5 | 5.3 | 7.0 |
| Ep 3 | 6.7 | 5.7 | 6.0 |
| Ep 4 | 7.0 | 5.2 | 6.0 |
| Ep 5 | 6.0 | 5.5 | 6.0 |
| Ep 6 | 5.3 | 6.8 | 6.0 |
| Ep 7 | 6.3 | 6.0 | 5.5 |
| Ep 8 | 7.0 | 4.5 | 6.0 |
| Ep 9 | 5.7 | 5.0 | 4.0 |
| Ep 10 | 5.3 | 5.0 | 6.0 |
| Ep 11 | 6.3 | 5.0 | 5.0 |
| Ep 12 | 6.7 | 5.0 | 5.0 |
| Ep 13 | 6.0 | 6.0 | 5.0 |
| Ep 14 | 5.8 | 6.0 | 5.0 |
| Ep 15 | 6.3 | 7.0 | 5.0 |
| Ep 16 | 6.7 | 4.0 | 6.0 |
| Ep 17 | 6.7 | 4.0 | 5.0 |
| Ep 18 | 5.5 | 4.0 | 5.0 |
| Ep 19 | 6.0 | 4.5 | 5.0 |
| Ep 20 | 6.7 | 5.0 | 6.0 |
| Ep 21 | 6.3 | 5.0 | 4.0 |
| Ep 22 | 6.0 | 6.0 | 7.0 |
| Ep 23 | 5.3 | 5.0 | 7.0 |
| Ep 24 | 5.3 | 6.0 | 6.0 |
| Ep 25 | 5.0 | 5.0 | – |
| Ep 26 | 5.3 | 6.0 | – |
| Ep 27 | 6.0 | 6.0 | – |
| Ep 28 | 5.5 | 6.0 | – |
| Ep 29 | 7.0 | 5.0 | – |
| Ep 30 | – | 5.0 | – |
| Season Avg | 6.1 | 5.4 | 5.6 |
Ratings Analysis & Trajectory
Across 3 seasons and 83 episodes, Lost in Space has earned an overall series rating of 5.7 out of 10. The series reached its critical peak early, showing a slight contraction in audience satisfaction in later chapters.
The single highest-rated hour of television in the series is Season 1, Episode 1 ("The Reluctant Stowaway"), rated at an extraordinary 7.0/10 with 4 ratings. Conversely, the lowest-rated installment is Season 3, Episode 21 ("Space Beauty"), landing at 4.0/10.
The most precipitous single-episode shift occurred in Season 2 between Episode 15 ("The Golden Man", 7) and Episode 16 ("The Girl From the Green Dimension", 4), a swing of 3 points.
Top 10 Highest Rated Episodes of Lost in Space
| Rank | Episode | Title | Score | Votes | Air Date |
|---|---|---|---|---|---|
| #1 | Season 1, Ep 1 | The Reluctant Stowaway | 7.0 | 4 | Sep 15, 1965 |
| #2 | Season 1, Ep 4 | There Were Giants in the Earth | 7.0 | 3 | Oct 6, 1965 |
| #3 | Season 1, Ep 8 | Invaders from the Fifth Dimension | 7.0 | 3 | Nov 3, 1965 |
| #4 | Season 1, Ep 29 | Follow the Leader | 7.0 | 3 | Apr 27, 1966 |
| #5 | Season 2, Ep 15 | The Golden Man | 7.0 | 2 | Dec 28, 1966 |
| #6 | Season 3, Ep 2 | Visit to a Hostile Planet | 7.0 | 1 | Sep 13, 1967 |
| #7 | Season 3, Ep 22 | The Flaming Planet | 7.0 | 1 | Feb 21, 1968 |
| #8 | Season 3, Ep 23 | The Great Vegetable Rebellion | 7.0 | 1 | Feb 28, 1968 |
| #9 | Season 2, Ep 6 | The Prisoners of Space | 6.8 | 4 | Oct 19, 1966 |
| #10 | Season 1, Ep 3 | Island in the Sky | 6.7 | 3 | Sep 29, 1965 |