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First appeared in Detective Comics #469 in 1977 and was created by Steve Englehart and Walt Simonson. Dr. Alexander Sartorious was a nuclear scientist who became Doctor Phosphorus after being present in a nuclear plant during a meltdown.
Doctor Phosphorus
Steve Englehart
for Steve Englehart in Most notable comic characters by creator
Suggested by mikeypascual
Which characters do you think the writers are most notable for creating?
