As Arc Two opened, the Autobots quickly realized the need to strengthen their forces on Earth. Thus, they called in some reinforcements. This group right here? That's them.

Rear:
Omega Sentinel (Reinforcements, 15-52)

Middle Rear, Left to Right:
Landmine (Reinforcements, 15-52)
Jetfire (Out of the Past 1-52)

Middle, Left to Right:
Beachcomber (Reinforcements, 15-52)
Ironhide (Reinforcements, 15-52)

Middle Front, Left to Right:
Crosswise (Reinforcements, 15-52)
Overhaul (Reinforcements, 15-52)
Sideswipe (Out of the Past, 1-52)

Front, Left to Right:
Comettor (Threads, 17-52)
Nightbeat (Threads, 17-52)