Transformers: Prime (2010)

S1E14 Out of His Head

Megatron seizes control of Bumblebee's consciousness, manipulating him from within as they operate at headquarters. With Bumblebee's actions being dictated by Megatron's sinister influence, tensions rise among the Autobots as they struggle to uncover the source of his erratic behavior and save their teammate from the clutches of the Decepticon leader.