Something about a huge cube that a large robot wants a small boy to shove into his chest cavity.

"SAM, IF I CANNOT DEFEAT MEGATRON, SHOVE THE ALL-SPARK INTO MY CHEST...

...

"IF I CAN DEFEAT MEGATRON, DO IT ANYWAY. I WILL GIVE YOU INSTRUCTIONS THAT YOU ARE TO FOLLOW. YOU MAY NOT LEAVE UNTIL WE ARE DONE."