Prime says,
"Thanks for transforming."
Episode: Desertion of the Dinobots
Context: Ravage attacks Prime, and then uncharacteristically transforms back into a helpless cassette. Prime picks him up and drops him in a trash can.
Sam: "If we do what they want how can we live with ourselves?"
Prime: "You are my friend, Sam. But your leaders have spoken. From here the fight will be your own."
Episode: Transformers: Dark of the Moon
Context: Sam says goodbye to the Autobots, who have been banished from earth.
Pictured: Waiting for the DVD
Prime says,
"Stay behind me!"
Episode: Transformers: Dark of the Moon
Context: Optimus gears up in his trailer while telling the N.E.S.T. soldiers to stay back. He always puts himself on the front line.
Pictured: OP and his transformed trailer
Prime says,
"Sentinel Prime, we bid you return."
Episode: Transformers: Dark of the Moon
Context: Optimus uses the Matrix of Leadership to bring Sentinel Prime back from near death.
Pictured: Optimus with the Matrix
Prime says,
"Shockwave can't hunt all of us at once. Wreckers, we need a diversion."
Episode: Transformers: Dark of the Moon
Context: Prime commands the Autobots as they try to retake Chicago.
Pictured: Waiting for the DVD
Prime says,
"We were once a peaceful race of intelligent mechanical beings, but then came the war between the Autobots who fought for freedom and the Decepticons who dreamed of tyranny."
Episode: Transformers: Dark of the Moon
Context: Optimus sets up the history of the Cybertronian civil war.
Pictured:Waiting for the DVD.
Bumblebee: "Is that good or bad?"
Optimus: "We’re locked inside an enemy prison surrounded by countless Decepticons bent on our destruction."
Bumblebee: "So it IS bad."
Optimus: "It’s purely a matter of perspective."
Episode: War for Cybertron: Kaon Prison Break
Context: Optimus tries to help Bumblebee reorient himself while in hostile territory.
Pictured: Sideswipe and Optimus
Prime says,
"In war, there are calms between storms. There will be days when we lose faith, days when our allies turn against us."
Episode: Transformers: Dark of the Moon
Context: Prime delivers the epilogue after the Chicago battle.
Pictured: Waiting for the DVD
Prime says,
"You were our leader, Sentinel. It is your right to lead us again."
Episode: Transformers: Dark of the Moon
Context: Optimus relinquishes command of the Autobots and the Matrix of Leadership to Sentinel, but the elder Autobot refuses.
Pictured: Waiting for the DVD
Megatron: "Who would you be without me, Prime?"
Optimus: "Time to find out."
Episode: Transformers: Dark of the Moon
Context: Megatron does the double-double-cross. Optimus has had all he can stands, and he can't stands no more. His battle mask slides down and it is SOOOO on.
Pictured: Optimus
Prime says,
"What your leaders say is true. This was all my fault. I told them whom to trust. I was so wrong."
Episode: Transformers: Dark of the Moon
Context: Banished from earth as rebels, Optimus takes responsibility for the betrayal of one of their own.
Pictured: Waiting for the DVD
Prime says,
"One shall stand, one shall fall."
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Episode: Transformers (2007), Transformers: The Movie (1986)
Context: Optimus Prime's iconic ultimatum to Megatron in both movies.