| Uncanny X-Men #363 | Early January |
| X-Men #83 | January |
| Uncanny X-Men #364 | Late January |
| X-Men #84 | Early February |
| Uncanny X-Men #365 | February |
| X-Men #85 | Late February |
| Gambit #1 | February |
| X-Men: Liberators #4 | February |
| X-Men: Magneto War | March |
| Uncanny X-Men #366 | March |
| Generation X #49 | March |
| X-Men #86 | March |
| X-Men Unlimited #22 | March |
| Uncanny X-Men #367 | April |
| X-Men #87 | April |
| Peter Parker: Spider-Man #4 | April |
| Uncanny X-Men #368 | May |
| X-Men #88 | May |
| Uncanny X-Men #369 | June |
| X-Men #89 | June |
| X-Men Unlimited #23 | June |
| Uncanny X-Men #370 | July |
| X-Men #90 | July |
| Wolverine #140 | July |
| Uncanny X-Men #371 | August |
| X-Men #91 | August |
| X-Men Annual 1999 | August |
| Gambit #7 | August |
| Uncanny X-Men #372 | September |
| Gambit Annual 1999 | September |
| X-Men #92 | September |
| Uncanny X-Men #373 | October |
| Uncanny X-Men #374 | November |
| Uncanny X-Men #375 | December |
| X-Men #95 | December |
| Wolverine #145 | December |
| X-Men Unlimited #25 | December |