Twilight's Last Gleaming
In "Twilight's Last Gleaming" part 3, Bumblebee attempts to take on Megatron in the Sector 7 base as Mikaela attempts to free Optimus Prime, but she is attacked by Frenzy. In part 4, Mikaela frees Prime and freezes Frenzy just as Autobot reinforcements arrive and assist Bumblebee in fighting Megatron.