One year after Mandroid's defeat and the Emberstone's shattering, the Maltos go on a search for the shards. When a Decepticon creates a new foe from a broken shard, the Maltos realize life in Witwicky is about to be chaotic.

While searching for Emberstone shards, Mo and Thrash stumble upon ancient ruins where a Quintesson Executioner lay in stasis. The duo try to care for the creature, after it follows them home but they fail to realize it has a plan of its own.

Hashtag helps the Autobots get rid of all the old GHOST stuff around base, which has her feeling like her GHOST van alt-mode is obsolete, too. Meanwhile, Shockwave needs to acquire a GHOST hard drive that holds a key to Starscream's master plan.

Robby, Mo, Twitch, and Thrash attend a carnival where Robby develops a crush on a new student, while Twitch, Thrash, and Mo encounter trouble with the carnival's Fairmaster. As the heroes battle Fairmaestro, they unlock a new power: cyber-syncing.

Jawbreaker wants to cyber-sync, but he's left out. Walking home, he saves Aftermath from a woodland monster. The two spend the day together and accidentally sync into one awkward bot.

Twitch welcomes a new Terran to the family...

Twitch and Spitfire accidentally swap bodies. It's hard for both to avoid getting caught behind enemy lines. The Decepticons plan to attack Twitch's friends and allies.

Optimus lands a prestigious photoshoot, so Robby and Hashtag take his battle worn trailer to get detailed. Unfortunately, the Decepticons steal it from them, leading the kids to race the clock to get it back in one piece.

Mo and Hashtag find a giant secret beneath Witwicky, and Starscream plans to use it for evil.

To do so, Starscream needs to rebuild the shattered Emberstone. Robby rallies his family and the Autobots to stop him, and end the chaos once and for all.