The Serpent Squad was created by Steve Englehart and Sal Buscema in 1973 and first appeared in Captain America # 163.
The first Serpent Squad
Viper (Jordan Stryke), Eel (Leopold Stryke) and Cobra.
Second Serpent Squad
Viper ( Madame Hydra), Eel (Leopold Stryke), Cobra and Princess Python.
Third Serpent Squad
Sidewinder, Anaconda, Black Mamba and Death Adder.
Fourth Serpent Squad
Fer-de-Lance, Black Racer, Copperhead (David Lawfers) and Puff Adder.
Current Serpent Squad
Sin, Eel (Edward Lavell), Cobra and Viper (new)
Ultimate Serpent Squad
The Ultimate version of the Serpent Squad is an all-women version. The team consists of Asp, Black Mamba, Princess Python, Anaconda and Death Adder. They only hunt for the Serpent Crown. They first appeared fighting the Ultimate Fantastic Four but they failed and were captured. The second time they confronted Spider-Man and his Amazing Friends( Iceman and Human Torch) plus Rick Jones aka Nova. Again they failed.