The first film
- Alex's first real roar. Each one gets louder and more savage.
- Seeing all the dead human skeletons in the crashed plane is enough to make anyone uncomfortable. it doesn't help that they are constantly flung around and played with like toys.
- Alex's growing Sanity Slippage as he becomes a true, wild, hungry lion out to eat his own friends as they're trapped in Madagascar.
- For Alex, when he was in a crate at sea. He was probably having unwanted flashbacks to when he was a cub, which we see in the second movie.
The second film