Per Degaton (Earth-2: Post-Crisis)

"What happened to Per Degaton? Per Degaton? Uh... The Flash banished him to an alternate timeline."

- Courtney Whitmore and Pat Dugan

Per Degaton was an enemy of The Flash and a member of the Injustice Society of America.

Injustice Society of America
At some point, Per Degaton became a member of the Injustice Society of America. He later battled The Flash and was banished to an alternate timeline.