The Legion Clubhouse #010: Dead - Not Dead

In this episode of The Legion Clubhouse, Element Lad joins the team and Action Comics #308 features the return of a dead Legionnaire... or does it?

In the city of Metropolis, in the 30th Century, there exists one of the most amazing clubs of all time! It's members are teen-aged youths, each possessing on special super-powers! The club members have vowed to use their fantastic power to battle crime... This rocket shaped building is the Legion Clubhouse!

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Adventure Comics #307
The Secret Power of the Mystery Super-Hero
April 1963
w: Edmond Hamilton
a: John Forte
With the space pirate known as Roxxas on the loose, looting various planets, the Legion of Super-Heroes decides to take on one more new member before tackling the criminal. After the typical number of "dud" heroes, the Legion agrees to select Mystery Lad, who only reveals the true nature of his powers to Saturn Girl in secret.

The Legion accepts him on Saturn Girl's say so, and Mystery Lad joins the group on their quest to stop Roxxas. During their battle, Mystery Lad exhibits different supposed abilities that keep the other Legion members missing. However, when Roxxas recognizes Mystery Lad for what he can really do - Change the properties of matter - Mystery Lad decides to turn himself over to Roxxas so nobody else gets hurt. However, when "Mystery Boy" refuses to turn objects into gold for Roxxas, he changes the gas aboard the ship into a toxic one that threatens to kill him. Roxxas and his goons, wearing space helmets manage to avoid the effects of the gas and try to make their escape. However, they are captured by the Legion who manage to arrive just in time to save Mystery Lad's life. In the aftermath of their adventure, Mystery Lad is accepted into the Legion, and rechristened Element Lad. -via DC Wikia

Adventure Comics #308
The Return of Lightning Lad!
May 1963
w:Edmond Hamilton
a: John Forte
While draping a ceremonial cape on the grave of the recently deceased Lightning Lad, the Legion of Super-Heroes is shocked when Lightning Lad seemingly rises from his coffin, alive and well. After recharging his apparent lost powers, Lightning Lad rejoins the Legion. However, on their daily routine of missions, each of the Legion members (including Chameleon Boy's new pet Proty) begin to suspect that the person aiding them is not their Lightning Lad.

After busting up some alien criminals, the Legion figures out the truth, that this is not really Lightning Lad at all, but his twin sister disguised as him. She reveals that she took the body of her brother to a planet where there is perpetual lightning as a suitable resting place and decided to take his place to continue his heroic tradition in his place. With the truth revealed, the Legion accepts her into their team and she is rechristened as Lightning Lass. - via DCWikia