Engine Defenders: Extreme

Engine Defenders: Extreme is the 2014 sequel to Engine Defenders.

Plot
One year after the DarkGlass Empire was defeated, a new evil emerges to take its place; the Crisis Zone Army. Coming from the Crisis Zone, this new army is made up of four planetary forces; the armies of the planets of fire, ice, earth and water. Assembled by the Great Crisis Emperor Overlord, the new armies eek to steal Earth's resources in order to breathe new life into their dying worlds.

In order to oppose the threat, the Engine Defenders team are reformatted with new vehicle modes as well as an entirely new team member; the female Firecracker, and then set out to combat the Zone Army.

Characters
Automus: He is reformatted as a fire truck. His relationship with Blitz and his leadership skills have improved since the previous series.

Thrust: He is reformatted into police car. He remains best friends with Tracks, and they still tend to annoy Blitz, although he has since grown used to them.

Brawl: He is reofrmatted as an ambulance, with much less yellow. He is still like a brother to Thrust, and cares very deeply for him. He has also begun to view Tracks as a brother too, or atleast a nephew, as he points out.

Blitz: Although he is only upgraded to a newer tank mode, Blitz is still skilled fighter and carries an incredibly powerful arm cannon. He has also grown fond of Thrust and Tracks' pranks, although they do occasionally still annoy him.

Tracks: He is reformatted as a jet. This is a flipside to the previous series, in which Tracks was jealous of Thrust's vehicle mode, and now Thrust is jealous.

Firecracker: A flirtatious new motorcycle, she has grown closest to Automus over the course of the series. She wields a mace in battle.

Crisis Zone Army
They come from the Crisis Zone to terrorize Earth.