The Substitutes
When the Legion are tied up fighting a horde of creatures consuming the Earth's ionosphere, the rejects from the yearly Legion Auditions are the only ones standing between Earth and total destruction.
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S1 E1
Man of Tomorrow
It is the 31st century. A group of super heroes called the Legion of Super Heroes travel back in time to recruit earth's greatest super hero, Superman, to help fight the evil of their time. While their intentions were good, good intentions don't always produce good results. Instead of bringing back Superman, they retrieve a young Clark Kent from his farm in Smallville to the future.
S1 E2
Timber Wolf
A scientist asks the Legion to help him capture what he claims is a dangerous creature, but both the creature and the scientist have a dark secret.
S1 E3
Legacy
Superman makes a new friend, Alexis, but his new chum soon becomes obsessive about having Superman as her only friend and not sharing him with anyone else...including the Legion.
S1 E4
Phantoms
Superman accidentally opens a portal to a phantom dimension, unleashing a teenager with powers that match his own who eventually traps the other Legionnaires there.