Five more episodes from the first series of the CGI-animated franchise in which the Autobots and Decepticons return to do battle once again. While Arcee and Jack have their hands full dealing with the crash-landed Decepticon Airachnid, Optimus becomes infected with a deadly Decepticon plague, the cure for which is hidden within Megatron's mind. The episodes are: 'Speed Metal', 'Predatory', 'Sick Mind', 'Out of His Head' and 'Shadowzone'.