"Killers" is Maiden's 2nd studio album, and with the great Martin Birch producing, this album sounds much better that the debut. Released on 16 February 1981, it was the band's last album to feature Paul Di'Anno, and the first to feature guitarist Adrian Smith.
Mostly composed by Steve Harris, with only "Twilight Zone" and the title track being co-written by others.
The US version included "Twilight Zone," and the Australian edition featured a cover of "Women in Uniform" by Skyhooks as a bonus track.
The Killer World Tour included the band's first shows in the United States, starting at The Aladdin in Las Vegas in support of Judas Priest.
In New York, Adrian picks up the US release of the 1970 Skid Row album Skid, and Dave obvisouly didn't get the 'wear white shoes' memo.

| No. | Title | Writer(s) | Length |
|---|---|---|---|
| 1. | The Ides of March | Harris | 1:48 |
| 2. | Wrathchild | Harris | 2:54 |
| 3. | Murders in the Rue Morgue | Harris | 4:14 |
| 4. | Another Life | Harris | 3:22 |
| 5. | Genghis Khan | Harris | 3:02 |
| 6. | Innocent Exile | Harris | 3:50 |
Total length: 38:18
| No. | Title | Writer(s) | Length |
|---|---|---|---|
| 7. | Killers | Di'Anno, Harris | 4:58 |
| 8. | Prodigal Son | Harris | 6:05 |
| 9. | Purgatory | Harris | 3:18 |
| 10. | Drifter | Harris | 4:47 |
Total length: 40:51
| No. | Title | Writer(s) | Length |
|---|---|---|---|
| 7. | Killers | Di'Anno, Harris | 4:58 |
| 8. | Twilight Zone | Murray, Harris | 2:33 |
| 9. | Prodigal Son | Harris | 6:05 |
| 10. | Purgatory | Harris | 3:18 |
| 11. | Drifter | Harris | 4:47 |
Total length: 40:51
| No. | Title | Writer(s) | Length |
|---|---|---|---|
| 7. | Killers | Di'Anno, Harris | 4:58 |
| 8. | Women in Uniform (Skyhooks cover) | Macainsh | 3:07 |
| 9. | Prodigal Son | Harris | 6:05 |
| 10. | Purgatory | Harris | 3:18 |
| 11. | Drifter | Harris | 4:47 |
Total length: 41:25
| No. | Title | Writer(s) | Length |
|---|---|---|---|
| 1. | Twilight Zone | Murray, Harris | 2:33 |
| 2. | Women in Uniform (Skyhooks cover) | Macainsh | 3:07 |
| 3. | Invasion | Harris | 2:38 |
| 4. | Phantom of the Opera (live) | Harris | 6:55 |
Total length: 15:13
| No. | Title | Writer(s) | Length |
|---|---|---|---|
| 1. | Women in Uniform (Skyhooks cover) | Macainsh | 3:07 |
| 2. | Invasion | Harris | 2:38 |
| 3. | Phantom of the Opera (live) | Harris | 6:55 |
| 4. | Running Free (live; from Maiden Japan) | Harris, Di'Anno | 3:07 |
| 5. | Remember Tomorrow (live; from Maiden Japan) | Harris, Di'Anno | 5:44 |
| 6. | Wrathchild (live; from Maiden Japan) | Harris | 2:52 |
| 7. | Killers (live; from Maiden Japan) | Harris, Di'Anno | 4:50 |
| 8. | Innocent Exile (live; from Maiden Japan) | Harris | 3:46 |
Total length: 32:59
| No. | Title | Writer(s) | Length |
|---|---|---|---|
| 1. | The Ides of March | Harris | 1:46 |
| 2. | Wrathchild | Harris | 2:55 |
| 3. | Murders in the Rue Morgue | Harris | 4:19 |
| 4. | Another Life | Harris | 3:23 |
| 5. | Genghis Khan | Harris | 3:09 |
| 6. | Innocent Exile | Harris | 3:54 |
| 7. | Killers | Di'Anno, Harris | 5:01 |
| 8. | Prodigal Son | Harris | 6:12 |
| 9. | Purgatory | Harris | 3:20 |
| 10. | Twilight Zone | Murray, Harris | 2:33 |
| 11. | Drifter | Harris | 4:49 |
Total length: 41:21