Kryptonite Monkey

The pet monkey of Kryptonite Man, who is really Lex Luthor. Kryptonite Monkey was originally just a lab monkey until Lex Luthor tested his Kryptonite based serum, which he created by dissolving a Kryptonite meteor, on the monkey. Once he tested the serum on the lab monkey, the monkey 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 to blow a banana from a nearby boy's hand toward the drainpipe. Clark's plan worked as:

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

Superman recovers and flies away before Kryptonite Monkey can come out.

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