Source: Superman's Girlfriend, Lois Lane #21 (1960)
Type: Remplacement (in Lois' heart)
Nightwing, of Nightwing & Flamebird Kandorian fame).
In postscript, Superman finds the doll, disarms the bomb, and by COMPLETE COINCIDENCE, Superman captures the culprits whose getaway plane is caught in a hurricane. If you want to attract Superman's attention, try to crash your plane, that usually works. As a final irony, the hurricane is called Lois, so she sort of stopped the bad guys, kind of. Hm.