Dark Angels was a story that appeared in the later weekly editions of Eagle (starting in issue 423). It was scripted by Tom Tully and illustrated by Solano Lopez.
The series had a shaky start - the artwork for the second episode was lost in the post and issue 424 instead ran with Dark Angel character profiles. The series resumed in issue 425 and had an unboken run until it's final episode, 40+ issues later in Eagle 465.
There were two further one-off stories in the monthly Eagle (issue 474) and the Eagle Yearbook 1992.