Avengers Forever

Through the years, The Avengers have always found a way to reach victory
-- no matter the odds, no matter the sacrifice.  But now, Earth's
Mightiest Heroes face a different find of menace.  A menace so great, it
has made allies out of sworn enemies.  This seemingly unconquerable
enemy is ... the future!  Seven time-lost Avengers--plucked from the
past, present, and future--must protect their longtime ally Rick Jones
from death at the hands of Immortus, the Master of Time.  To find out
why Rick has been targeted for elimination, the Avengers must join
forces with Kang the Conqueror, one of the team's deadliest, most
implacable foes n a cosmic battle that stretches from the Old West to
the End of Time.  As they do so, they discover they're fighting not just
for one life, but for the very destiny of mankind--against a greater
foes than they could possibly imagine.

Collecting: Avengers Forever #1-12 -- written by Kurt Busiek and Roger Stern, and illustrated by Carlos Pacheco and Jesus Merino.