Lennox : That's the Matrix of Leadership, the only thing in the Universe that can repower a Transformer's spark.
Optimus Prime : Let us begin... Sentinel Prime, we bid you return.
Lennox : Hold your fire!
Optimus Prime : Stop! Sentinel, it is I, Optimus Prime!
Ironhide : You are home, Sentinel.
Ratchet : There is nothing to fear.
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From: Transformers: Dark of the Moon (2011)