Top Grossing Sci-Fi Movies in 1988
| Rank | Title | Language | Domestic | Worldwide |
|---|---|---|---|---|
| 1 | Alien Nation |  EN | $25,216,243 | $32,155,047 |
| 2 | Cocoon: The Return | EN | $18,924,919 | $25,024,919 |
| 3 | My Stepmother Is an Alien | EN | $13,854,000 | $13,854,000 |
| 4 | They Live | EN | $13,447,978 | $13,450,603 |
| 5 | Return of the Living Dead II | EN | $9,205,924 | $9,207,551 |
| 6 | The Blob | EN | $8,247,943 | $8,248,791 |
| 7 | Phantasm II | EN | $7,282,851 | $7,283,766 |
| 8 | Mac and Me | EN | $6,424,112 | $6,424,112 |
| 9 | Monkey Shines | EN | $5,344,577 | $5,344,577 |
| 10 | Critters 2 | EN | $3,813,293 | $3,813,293 |
| 11 | Watchers | EN | $940,173 | $940,173 |
| 12 | Space Mutiny | EN | $397,887 | $397,887 |
| 13 | Killer Klowns from Outer Space | EN | - | $1,412 |
| 14 | On the Silver Globe |  PL | - | $557 |
| 15 | Hobgoblins | EN | - | - |
| 16 | Return of the Killer Tomatoes! | EN | - | - |
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