Shadowline was a short-lived Marvel Comics imprint set in a universe completely unconnected to previous universes.

1. Doctor Zero #1 - Shadows of Troy (April, 1988)
2. Doctor Zero #2 - The Judas Goat (June, 1988)
3. Doctor Zero #3 - Starlight, Starbright (August, 1988)
4. Doctor Zero #4 - ...A Million Deaths Is A Statistic (October, 1988)
5. Powerline #1 - Nexus (May, 1988)
6. St George #1 - When Mercy Seasons Justice (June, 1988)
7. Powerline #2 - Across This Great Nation (July, 1988)
8. St George #2 - The Thing In The Closet (August, 1988)
9. Powerline #3 - Every Purpose Under Heaven (September, 1988)
10. St George #3 - Light Against The Darkness (October, 1988)
11. Powerline #4 - Amateur Night (November, 1988)
12. St George #4 - It Is In the Giving That We Receive... (December, 1988)
13. Doctor Zero #5 - ...A Million Deaths Is A Statistic (December, 1988)
14. Powerline #5 - Child's Play (January, 1988)
15. St George #5 - And It Is in the Dying... (February, 1989)
16. Doctor Zero #6 - The Belly of the Whale (February, 1989)
17. Powerline #6 - A Family Tradition (March, 1989)
18. St George #6 - Skinwalker (April, 1989)
19. Doctor Zero #7 - Man Is But A Dream Of A Shadow (April, 1989)
20. Powerline #7 - Hidden Cargo (May, 1989)
21. St George #7 - The Road of Trials (June, 1989)
22. Doctor Zero #8 - The Weight of Time (June, 1989)
23. Powerline #8 - On Our Own (July, 1989)
24. St George #8 - Grace (August, 1989)
25. Critical Mass #1 - Foreword (January, 1990)
26. Critical Mass #2 - A Knight Without Armor / Gravediggers Dilemma (February, 1990)
27. Critical Mass #3 - Standing Before the Rubicon / Beating the Devil's Tattoo (March, 1990)
28. Critical Mass #4 - The Mouth of Truth (April, 1990)
29. Critical Mass #5 - St. George - The Crossing of the Return Threshold (May, 1990)
30. Critical Mass #6 - June, 1990 - The Gathering of Storm Clouds / How St. George Slew the Dragon
31. Critical Mass #7 - The Shatterer of Worlds / The Bringers of Chaos / Hero With a Thousand Faces (July, 1990)