Story arcs
From the storyline tags ComicRack's scraper wrote into your files (AlternateSeries), grouped the way the tag groups them. An arc lists the issues you have; issues of an arc you're missing need Metron's arc lists, a later piece.
The Transformers · 2 arcs, 7 issues
The Transformers: All Hail Megatron · 1 arc, 16 issues
Transformers · 1 arc, 4 issues
- Unicron 4