Felix Silla was an Italian-born actor and stuntman who played one of the Talosians in the first Star Trek pilot, The Cage, and is widely known as Cousin Itt.
Felix Silla (1937–2021) was a former circus performer who built a long Hollywood career in costumed and character parts. His best-known roles outside Star Trek were Cousin Itt in The Addams Family and the robot Twiki in Buck Rogers in the 25th Century.
In 1964 he was cast as one of the Talosians in The Cage, the first pilot for Star Trek. He appears among the large-headed aliens who observe Captain Pike in his cell beneath the surface of Talos IV, alongside Meg Wyllie's Keeper.
Because footage from the pilot was re-used in the two-part episode The Menagerie, Silla's Talosian was also seen in the broadcast run of The Original Series.