DC Database

John Diggle was a S.T.A.R. Labs agent under the command of Superman in an altered reality.

After John Deegan changed himself into a version of Superman using the Book of Destiny, he also reshaped the reality. John Diggle was turned into an agent of S.T.A.R. Labs which was now ruled by Superman.

Diggle was a member of the Labs' team of agents that also included Alex Danvers and the metahuman Caitlin Snow aka Killer Frost.

After Alex Danvers freed the powerless Supergirl from the pipeline, Diggle tried to stop the fugitives, along with Superman and Killer Frost, but Barry Allen and Oliver Queen with the help of the real Superman stopped the villains and helped the two girl escape. Later, Diggle and Frost were imprisoned in the Labs' pipeline.

John Diggle was erased from existence, along with his home reality, after John Deegan lost his connection with the Book of Destiny so the heroes restored the original universe.[1]