The Silver Age of Superman figures are based on the comics written between 1950 and 1960 and illustrated by Kurt Schaffenberger.
In Superman’s Girl Friend, Lois Lane, #21, Lois Lane and Lana Lang develop superpowers. Do they go and save the world?
No, they spend their time fighting over who gets to marry Superman and now that he doesn’t have to worry about his enemies hurting them, he has no excuse not to choose to settle down with one of them. For pictures from the original artwork and story go to the I Love Lois (Lane) site.
And who is the monkey? Beepo stowed away on the rocket carrying Superboy from Krypton to the safety of earth. Of course, Beepo developed superpowers as well, but being a mischevious monkey, he drove Superboy nuts. See the Archangels website for a great cover picture.

I asked DC Comics if they were going to reprint some of the Silver Age comics to go with the action figures, but they don’t plan on it. Instead they recommended:
SHOWCASE PRESENTS: SUPERMAN VOL. 1
Written by Jerry Siegel, Bill Finger and others; Art by Curt Swan, Dick Sprang and others; Cover by Swan and George Klein Kicking off an exciting line of black-and-white reading library titles! This volume collects SUPERMAN #122-133 and ACTION COMICS #241-257, featuring the birth of the Silver Age Superman mythos, including the first appearances of Supergirl, Brainiac, the Fortess of Solitude and more! 560 pages, Black and White, Softcover, $9.99, ISBN 1401207588 which went on sale September 28, 2005.


They also recommended checking out some of their other Trade Paperbacks. I thought this one looked good:
SUPERMAN IN THE FIFTIES
Written by Otto Binder, Jerry Coleman, Bill Finger, Edmond Hamilton, and others; Art by Al Plastino, Wayne Boring, Curt Swan, Kurt Schaffenberger, and others Written in the 1950s, the stories reprinted in this collection reflect the optimism and carefree excitement of that era.
In a decade of few real life villains, Superman’s adventures became more lighthearted and fun as he teamed up with Robin, the Boy Wonder or battled against such outrageous foes as Bizarro and the Bride of Bizarro. Also included in this collection are the first appearances of Supergirl, Krypto, and Titano the Super-Ape as well as tales of Superman’s Super-Magic Show and Superboy’s last day in Smallville. 189 pages, Color, Softcover, $19.95, ISBN 1563898268
Both are available at Amazon.com