Kryptonite Monkey

The pet monkey of Kryptonite Man, who is really Lex Luthor. Kryptonite Monkey was just an originally lab monkey until Lex Luthor tested his Kryptonite based serum which he created by dissolving a Kryptonite meteor. Once he tested the serum on the lab monkey he began to glow with a green color and emulate Kryptonite radiation from his body. Ultimately Kryptonite Monkey escapes Luthor's lab and goes to the Metropolis Zoo where Clark Kent, who is secretly Superman, is on assignment. When Clark Kent spots Kryptonite Monkey he thinks to himself:

Great Guns! Kryptonite radiations ... from that glowing monkey... are weakening me!

Clark Kent manages to spot a "leaden drainpipe" and decides to uses his super-breath yo blow a banana from a nearby boy's hand toward the drainpipe. Clark's plan worked as:

"he dived into the leaden drainpipe for the banana! Kryptonite radiations can't penetrate lead!"

Superman recovers and flies away before Kryptonite Monkey comes out.

(Act No. 249, Feb 1959: "The Kryptonite Man!")