Marvel Ultimate Graphic Novel Collection Issue 78 : Avengers vs. X-Men (Part 1)

From across the stars, the Phoenix Force hurtles towards Earth, ready to merge with its new host, Hope, the so-called mutant messiah. To the X-Men, its arrival heralds a potential rebirth for their beleaguered race, but for the Avengers the Phoenix is a planetary-level threat that could wipe out humankind. Negotiations between the two groups have failed and now the battlelines have been drawn. Only one option remains — fight!

Collecting Avengers vs. X-Men #0–4, AVX versus #1–2