"Prowl has disappeared."
The Transformers are varied, with different factions interacting with other factions with mixed results. One of those factions is the Wreckers, who IDW Publishing hasn't revisited for a few years. They're fixing that in Transformers: Sins of the Wreckers #1, written and illustrated by Nick Roche, colored by Josh Burcham and lettered by Tom B. Long.