The character first appeared in Strange Tales #130 (March 1965) and was created by Stan Lee and Steve Ditko.

Kaecilius made his live-action debut in the Marvel Cinematic Universe film Doctor Strange, portrayed by Mads Mikkelsen.

[1] Kaecilius first appeared in Strange Tales #130 (March 1965) and was created by Stan Lee and Steve Ditko.

Kaecilius is a disciple of Baron Mordo, who delivers messages and even fight Doctor Strange himself if necessary.

[3] Kaecilius and his cohorts, Adria and Demonicus, pose as members of the Independent Video media network to interview Strange and gain access to the Sanctum Sanctorum.