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The Legion of Superheroes send three members back in time- Saturn Girl, Cosmic Boy, and Chameleon Boy - to stop Brainiac from destroying a young Clark Kent before he can become Superman.
voiced Clark Kent / Superman / Kal-El
The three Legionnaires staring on this episode are credited with their real identities in the closing credits.
During Saturn Girl’s mind projection, we can see ten Legionnaires hanging out in the meeting room. They are (from left to right) Ultra Boy, Apparition, Dream Girl, Lightning Lad, Lightning Lass, Brainiac 5, Triad, Bouncing Boy, Kid Quantum and Andromeda.
Professor: I didn't know what to do, so I called the Legion of Super-Heroes.
Chameleon Boy: Ah, it's a little late. What do you need heroes for, if the villain is gone?
Professor: Didn't you hear me? I have no way of bringing you back!
Cosmic Boy: Let us worry about that!
Professor: This is crazy!
Chameleon Boy: You asked for heroes. You didn't' say anything about sanity.
Lana Lang: What's this strange power you have?
Clark: What do you mean?
Lana Lang: The ability to attract every airhead in Smallville.
Cosmic Boy: Is not right for a person to know his own future.
In the closing credits, Saturn Girl's "real" name is shown to be 'Irma Ardeen.' However, this is a typo, because her actual name is 'Imra.'
Bully: Check out Darth Vader. Que pasa, man, take a wrong turn at Tatooine?
Darth Vader (a.k.a. Anakin Skywalker) is a fictional character from the Star Wars movies. Tatooine is the home planet of the Skywalker family.
Chameleon Boy: "Up, up and away!!" I always wanted to say that.
This is an in-joke to the Superman radio show from the 40s, in which Superman often uttered that line to let the listeners know that he was taking off.