Yz (Earth-2: Post-Crisis)

"Don't touch the Thunderbolt! That's the most dangerous thing in here."

- Pat Dugan to Courtney Whitmore

Thunderbolt is a former member of the Justice Society of America.

Johnny Thunder & the Thunderbolt
At some point, Johnny Thunder began using Thunderbolt to fight crime as a member of the Justice Society of America. After Johnny's death, Thunderbolt was stored as a pink pen in the Justice Society of America headquarters.

Taken to Blue Valley
When Pat Dugan brought Courtney Whitmore to the Justice Society's headquarters, she attempted to pick up Thunderbolt's pen but was told not to as it was the most dangerous thing there. Courtney later returned to the headquarters and took numerous JSA artefacts, including the Thunderbolt. She later tried to use the Thunderbolt by clicking the pen but nothing happened even after several tries, so she placed it in a pencil holder and left the room.