Top 20 X-Men stories: Day 4

Rules:

1. Most combined upvotes wins

2. Name specific issues or arcs, not entire runs

3. Team books and crossovers are allowed, but they must be X-Men centric

4. Elseworlds are allowed, but they must be X-Men centric

5. Current ongoings (e.g. Simone Uncanny X-Men, Momoko Ultimate X-Men) are excluded

6. Only comics are allowed