This is how McQueen reveals he's not a spy goes in Cars 2 (remake).
[McQueen has a dream]
Lightning McQueen: Holley! Finn! Where are we?
Finn McMissile: We're in London, McQueen, inside Big Bentley.
[They are indeed in London]
Lightning McQueen: Whoa! Whoa! Oh, this... This is all my fault.
Finn McMissile: Don't be a fool, McQueen.
Lightning McQueen: But I am, remember? You said so.
Finn McMissile: When did I... [suddenly realizes] Oh. McQueen, I was complimenting you on what a good spy you are.
Lightning McQueen: I'M NOT A SPY!!!
["I'M NOT A SPY!!!" echoes through the entire clock]
[McQueen looks down]
Lightning McQueen: I've been trying to tell you that the whole time. I really am just a race car.
[Holley looks up]
Holley Shiftwell: Finn, he's not joking.
Finn McMissile: I know.
Lightning McQueen: You were right, Finn. I'm a fool. And what's happened to Mater is 'cause I'm such a big one. This is all my fault.
[Grem and Acer arrive]
Grem: Good, you're up!
Acer: And just in time!
Grem: Professor Z wanted you to have a front row seat for the death of Mater!
Lightning McQueen: He's still alive?
Grem: [pulls the sheet off revealing the WGP camera] Not for much longer!
[He points it outside at the track]
[At the pits, Sally and the other Radiator Springs folks have arrived]
Sally Carrera: We came as soon as you called.
Mater: I called to talk to McQueen.
Sally Carrera: He would want you to race for him.
Mater: I don't know.
Sally Carrera: Go on. Show them that even a tow truck can be a champion.
Mater: But what if I screw up?
Sally Carrera: You'll be fine. I promise.
Mater: Okay. For McQueen.
[He fills himself up and goes on to the track]
[The light goes green and the cars race off]
[Mater concentrates as he reaches second place]
[In the clock]
[McQueen watches as Mater passes by the big clock]
[Grem fires up the camera, however, Mater does not explode]
Zündapp: What happened?
Grem: I don't know, Professor.
[He listens to him as Acer talks over him]
Acer: What did you do?
Grem: I didn't do nothing. Ssh, I'm talking to the Professor. What's that, Professor?
Acer: You broke it!
Grem: Quiet! I understand, sir. Yes.
Acer: What did he say?
Grem: We go to the backup plan.
Lightning McQueen: Backup plan?
Grem: We snuck a bomb in your pit.
Acer: The next time your friend makes a stop, instead of saying "ka-chow", he's gonna go, ka-boom.
[Lightning races into the track]
British Officer Car: Come back here, STOP!
[He races on]
Lightning McQueen: Everybody get out! Get out now! You all gotta get out the pits! [sees that Sally, Ramone, Flo, and Red are in the pits] Hey, what're you guys doing here?
Sally Carrera: We're here because of you, McQueen!
Flo: Is everything okay?
Lightning McQueen: No! Everything's not okay. There's a bomb in here. You all gotta get out! Now!
Everyone: [shocked] A bomb? Huh? Woah.
Finn McMissile: [over radio] McQueen.
Lightning McQueen: Finn, you're okay!
Finn McMissile: Listen to me. The bomb is on you! They knew you'd try to help Mater.
Holley Shiftwell: It's a set up!
Finn McMissile: When we were knocked out, they planted it your engine block!
Sally Carrera: What?
[Lightning lifts his hood, inside is the bomb]
Lightning McQueen: Uh-oh.
Ramone: This is bad.
Mater: McQueen, there you are!
Lightning McQueen: Stop right thereǃ
Mater: Oh, man, I've been so worried about youǃ
Lightning McQueen: Don't come any closerǃ
Mater: Are you okay?
Flo: McQueen, what's going on?
Lightning McQueen: No, I'm not okayǃ Stay away from meǃ
Mater: No, wait, waitǃ
[McQueen goes onto the track]
Brent Mustangburger: Hold everything. A hot rod has just raced onto the track, and he's driving backwards!
[Mater goes after him]
Mater: McQueen, wait!
[The announcers watch]
David Hobbscap: Normally, an emergency vehicle on the track means there's been an accident.
[They spot Mater]
Brent: Wait, waitǃ Mater is chasing himǃ
[The chases continues]
Mater: McQueen, waitǃ
Lightning McQueen: Stay back! If you get close to me, you're gonna get hurt real bad!
Mater: I know I heard Sarge make you feel that way before, but none of that matters! Because we're best friends!
[The audience watches]
Brent Mustangburger: And Mater seems to be having a conversation with the hot rod!
Darrell Cartrip: I don't know who that race car is, Brent, but I'll tell you what, he's gotta be the world's best backwards driver!
[The events are shown on screen]
[Zündapp snickers and puts his tire near the detonation button]
[The chases continues]
Lightning McQueen: Mater, you don't get it! I'm the bomb!
Mater: Yes, McQueen, you are the bomb! That's what I'm trying to say here! You've always been the bomb, and you will always be the bomb.
Lightning McQueen: Stay away!
Mater: No, never!
[Mater speeds up]
Zündapp: [his tire is almost at the detonation button] Almost there.
[Mater catches up]
Mater: I'm not letting you get away again! [latches his tow hook onto Lightning]
Lightning McQueen: Gotta keep away from Mater!
Computer: Request acknowledged.
[Rockets come out of McQueen's back hinch]
Mater: [sees rockets; frightened] Oh, my gosh!
[He dodges the flames as the rockets fire up and send McQueen and Mater speeding through across the track]
Holley Shiftwell: McQueen, we've got to get that bomb off you.
Lightning McQueen: Yeah, they strapped it to me to kill you as a backup plan!
Mater: "Backup plan"?! McQueen, who put a bomb on you?
[Finn arrives with Zundapp]
Zündapp: You! Why didn't my death ray kill you?
Mater: Death ray?!
Finn McMissile: Turn off the bomb, Zündapp!
Zündapp: Are you all so dense? It's voice-activated. Everything is voice-activated these days.
Lightning McQueen: Deactivate, deactivate!
Bomb Computer: Voice denied.
[McQueen looks devastated]
Zündapp: Oops. Did I forget to mention that it can only be disarmed by the one who activated it?
Holley Shiftwell: [aims her tasers] Say it!
Bomb Computer: Voice denied.
[McQueen looks frightened]
Zündapp: Oh. I am not the one who activated it. Would anyone else like to try?
[Holley zaps him]
Finn McMissile: [smiles] You read my mind.
Holley Shiftwell: He was getting on my nerves.
[McQueen looks at the bomb]
Mater: What do we do?
[They then hear music]
Lemon leaders: What we have in store~
All we want and more~
We will break on through~
Now it's time to finish you~
Curby J Gremlin: Yeah, but it's worth a shot.
[Red blasts him with water from behind]
[Finn causes four Hugos to crash into each other]
[Holley uses her wings to defeat four others]
[Two Gremlins' tires come off, courtesy of Luigi and Guido]
Guido: Pit stop.
[Flo blinds one of the lemons]
[Sheriff puts a parking boot on him]
Sheriff: Not today, boys!
[Guido pushes another lemon forward]
[McQueen defends Mater]
[He hits Ivan and a few lemons and throws another at Ramone who paint sprays the lemon's eyes]
Unknown Lemon: Retreat!
[They run into Sarge and the army]
Sarge: Thanks for the help, Corporal.
British Corporal: Anything for one of pop's mates.