| X-51 (I) (0-12) (1999-2000) • X-51 The Machine Man (I) (0-12) (1999-2000) | ||||
| Title on cover is "X-51 Machine Man", in the indicia only "X-51". | ||||
| Series | No. | Date | Year | Title |
| X-51 | 0 | 1999 | A mere technicality | |
| X-51 | 1 | September | 1999 | The persistence of memory |
| X-51 | 2 | Late September | 1999 | Ghost in the shell |
| X-51 | 3 | October | 1999 | X.E.R.O. tolerance |
| X-51 | 4 | November | 1999 | With friends like these... |
| X-51 | 5 | December | 1999 | Circuits maximus |
| X-51 | 6 | January | 2000 | A view to a kill |
| X-51 | 7 | February | 2000 | The harder they fall |
| X-51 | 8 | March | 2000 | Aftermath |
| X-51 | 9 | April | 2000 | Starting over |
| X-51 | 10 | May | 2000 | Warzone 1/2: Road rage |
| X-51 | 11 | June | 2000 | Warzone 2/2: Communion |
| X-51 | 12 | July | 2000 | Space odyssey |
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