Transformers #21 will arrive in stores on July 6 from IDW Publishing. The issue is written by Mike Costa, with art by Guido Guidi and Brendan Cahill and covers by Marcelo Matere and Cahill.

Here's how IDW describes the issue:

"Transformers goes bi-weekly! Two stories for the price of one, kicking off the 'Chaos' event!! In part one, Rodimus makes his triumphant return to Earth, and sets off the major events that will spin off into Chaos. And in part two, Prowl begins his investigation...of Spike. This storyline will change Transformers forever!"

Transformers #21 will be 32 pages and will cost $3.99.