In season three, a giant-size Dome divides the town of Witwicky and traps the Decepticons inside, but it can't hold them forever. The Malto family and the Autobots must figure out a long-term solution, and help arrives from an unlikely place. While doing all they can to get life back to normal again, a mysterious saboteur threatens the Autobots, and Robby and Mo face a ruthless foe who challenges their right to wield the power of Quintus Prime.
Season Main Cast

Sydney Mikayla
voices Robby Malto
Zion Broadnax
voices Mo Malto
Kathreen Khavari
voices Twitch
Zeno Robinson
voices Thrash
Benni Latham
voices Dot Malto
Danny Pudi
voices Bumblebee
Cyrus Arnold
voices Jawbreaker
Stephanie Lemelin
voices Hashtag
Jon Jon Briones
voices Alex Malto
Z Infante
voices Nightshade
Alan Tudyk
voices Optimus Prime
Rory McCann
voices Megatron
Cissy Jones
voices Elita-1
Nolan North
voices Swindle
Marc Evan Jackson
voices Agent Scholder
Sean Kenin
voices Soundwave
Nicole Dubuc
voices Skywarp
Troy Baker
voices Shockwave
Jake Green
voices Laserbeak
Eric Bauza
voices Additional Voices
Siena Nicole Agudong
voices Izzy
Tiana Camacho
voices Frenzy
Roger Craig Smith
voices Breakdown
Kathreen Khavari
voices Crowd
Jon Jon Briones
voices Crowd
Zeno Robinson
voices Crowd
Martha Marion
voices Arcee
Richard Ayoade
voices Fairmaestro