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Strażnik w jednym z budynków na wyspie Hydra.
Aldo was apparently quite familiar with Alex and the other Others, and stated that her father would 'kill him' if he found out she was there. Also, he inadvertently revealed to Sawyer and Kate that Ben is Alex's father.
Aldo was sitting at the Hydra Station, reading, when Alex approached him with Sawyer and Kate, who were seemingly tied up. Alex told him that she caught them in the woods, and that Ben had told her to bring them there. Aldo was suspicious, but radioed Pickett and asked to talk to Ben for confirmation. Sawyer then tackled him, and Kate took his rifle. Kate threatened to shoot him in the knee if he didn't tell them where Karl was. He told them he was in Room 23. She took his keys and smacked him in the face with the rifle butt. He was knocked unconscious, and the three ventured inside the building to rescue Karl.
He was later seen with Pickett, who proceeded to violently wake him. Pickett asked him where Kate, Sawyer, Alex and Karl escaped to, to which Aldo was unable to provide an answer. Pickett left him, Ivan, and Jason at the Station when he ran off into the jungle.