Source: aminoapps.com

Chapter Five: The Energy Shield

And now it's time for the shield to break again. And break it did.

But this time, Cap replaced it with something brand new: a plasma energy shield with a flexible containment matrix that allowed the shield to materialize out of thin air. The circuitry for the shield, contained in Cap's glove, enabled him to arm or disarm with just a thought.

He could also fire the shield from his arm rather than just throwing it. And it didn't have to be a shield, either! Because it was just plasma in a containment unit, Captain America could reshape it into other handheld weapons. Whether it was a staff, stave, sword, spear, or anything else the good Captain wanted, he could make it happen.

He did eventually ditch it when he got his old shield back. Old habits die hard, I guess.

                                       Source: looper.com

Chapter Six: Superman

Ah, JLA/Avengers, you’re so good for these object history articles.

Throughout the majority of the series, Superman and Captain America had a burning, hateful rivalry that was spurred on by subliminal mind control from the series' antagonists. But the two legendary heroes had a bit of a talk as the teams prepared to go into battle in the last book. As a gesture of friendship, Cap offered Superman his shield to carry as he marched into battle on the front lines. The Big Blue Boy Scout also got to yell Avengers Assemble, which was fun.

He carried the shield through pretty much the entire battle (except for when the time waves reverted Cap to a time period when he used the energy shield). Unfortunately, this meant that we didn’t get to see Electric Blue Superman wield the shield, which was a personal disappointment for me. By the end of the book, Superman was one of the few heroes left, and he wielded Captain America's shield in one hand and Thor's hammer in the other.

What a badass comic panel.