Icicle Sr. is a supervillain who uses cryokinetic technology.
Icicle, despite his age, appears to be a man in his late forties. He has grey hair and beard and brown eyes. He wore the orange jumpsuit of a Belle Reve prisoner, along with the typical inhibitor collar.
He displayed very little interest in his son, Icicle Jr., and only demanded his presence when the situation required it. While imprisoned at Belle Reve Penitentiary, Icicle Sr. became the head of the prisoners. Icicle Sr. was a friend of Lawrence Crock's "back in the day".
In mid-September, Senior initiated a mass break out attempt with smuggled technology with the help of Captain Cold, Icicle Jr., Killer Frost, and Mister Freeze. Despite not escaping, Senior and Hugo Strange were satisfied with accomplishing multiple objectives, in part for the Light.
After five mysterious ice fortresses covered the United States with a blanket of snow, Batman and Flash suspected Icicle Sr. and the other ice-villains were involved. Hugo Strange told them they had been, and still were, in their cells. 
- In the comics, Icicle was an adversary of Green Lantern (Alan Scott) and later the Justice Society of America. He was killed during Crisis on Infinite Earths.
- This is his third animated appearance. He appeared in Super Friends and Superman/Batman: Public Enemies.
- ↑ 1.0 1.1 Weisman, Greg (2011-12-13). Question #13803. Ask Greg. Retrieved 2011-12-14.
- ↑ 2.0 2.1 2.2 Weisman, Greg (writer) & Oliva, Jay (director) (September 23, 2011). "Terrors". Young Justice. Season 1. Episode 11. Cartoon Network.
- ↑ Weisman, Greg (2012-05-17). Question #14981. Ask Greg. Retrieved 2012-05-17.
- ↑ Weisman, Greg, Kevin Hopps (w). Jones, Christopher (p). Davis, Dan (i). Atkinson, Zac (col). Sienty, Dezi (let). Chadwick, Jim (ed). "...And the Penalty" Young Justice 13 (February 15, 2012), New York, NY: DC Comics
- ↑ Weisman, Jon (writer) & Cook, Victor (director) (March 10, 2012). "Coldhearted". Young Justice. Season 1. Episode 20. Cartoon Network.
- ↑ Weisman, Greg (2012-05-08). Question #14880. Ask Greg. Retrieved 2012-05-08.