Gleek (Earth-Prime)

"Sounds like we need to call pest control. What was that?"

- Sara Lance and Barry Allen

Gleek is a creature that was kept in a cage at the Hall of Justice.

Biography
At some point, prior to the formation of the Justice League, Gleek was placed in a cage inside the Hall of Justice.

Gleek later broke out causing Sara Lance to remark that they "need to call pest control".