
Rex tries to avoid confronting Woody when he is accused of trying to jealously kill Buzz (although mostly because he doesn't want confrontation from either side) as Woody was being ambushed the first time Rex watched in horror, but slowly and reluctantly turns against him under peer pressure, quickly experiencing guilt later on when Bo Peep sees Woody with Buzz on RC. When Buzz Lightyear first came to Andy's room, he was just as amazed by him as all the other toys (as well as greatly relieved that Buzz wasn't another dinosaur) and even managed to become more fierce with his roar thanks to Buzz.


When the surprise present is unveiled to the kids and Sarge reports it, but is unable to ascertain the identity of the present, Rex ends up inadvertently wrecking the baby monitor due to his shaking the bedside due to impatiently wanting to know the identity of the surprise present. He is also shocked along with the toys when he learns that Andy's "birthday" was moved from the Wednesday of the following week to the current day, and expresses fear of his being replaced, especially if it was another carnivore-based dinosaur toy as he wouldn't take that rejection well. He learns to his dismay that the roar he emitted did not even come close to scaring Woody, and in fact it actually came off as annoying. In the beginning of the film, Rex attempts to try out his roar to Woody after luring him there by stealing his doodle pad. Toy Story "But what if Andy gets another dinosaur, a mean one? I just don't think I could take that kind of rejection!" -Rex thinks he's getting replaced
