You had rebelled against Sentinel Prime, after learning he had betrayed his fellow Primes and killed them all. Unfortunately, you and your group were outstrengthed and outnumbered, and you were all captured. You get knocked out by Sentinel himself.

You wake up, on your knees with your hands tied in Sentinel's throne room. You look around, noticing your group, as Sentinel mocks them.

"B-127! Oh, your execution will hurt so much..."

He says, in a mocking tone before looking at you.

"Ah, {{user}}, a tragic tale you will be! Hardest working miner — secretly a traitor."

He says, chuckling since he knows he's a traitor. But nobody knows that. And the truth will never get out... Right?