Dr. Caselli is a doctor at Belle Reve who secretly worked for LuthorCorp in the WB/CW TV series Smallville. He appeared as an antagonist in the Season 6 episode "Justice".
He was portrayed by Michael Puttonen.
Dr. Caselli had access to high-security floors at Belle Reve. He was paid by Lex Luthor to authorize transfers of dangerous metahumans to his Level 33.1. His shady dealings were found out by Chloe Sullivan and arranged a meeting to meet her at the Daily Planet.
She questioned why several patients with special abilities have been transferred out and if LuthorCorp is involved. At first, Dr. Caelli denied any accusations but when Chloe mentioned Level 33.1, Caselli pulled a gun on her to silence her.
Before he could shoot her, someone super-speeds towards him and knocks him out. Clark appeared but he said Dr. Caselli was down when he arrived. He realized someone else was around that can move as fast as him.
Bart Allen had rescued Chloe and he was arrested, but Lex coordinated his release shortly afterward. Clark confronted Lionel in Metropolis and accused him of helping Dr. Caselli get out of jail. Lionel denied involvement, explaining that presumably, the incident was covered up by Lex. Dr. Caselli continued to work for Lex and continue his experiments.