Young Justice: Knowledge of Krypton is the animated direct-to-video movie.
The Team have gained new members (Tempest, Aquagirl and Troia) in order to fight against the forces of evil, but when a new enemy emerges, the Team may have found allies in Lieutenant Marvel, Sergeant Marvel, Barbara Gordon, Jason Todd, Karen Beecher, Mal Duncan, La'Gann and Garfield Logan to help them stop this threat, taking place in the start of Team Year Three.
- The Team:
- Kaldur'ahm/Aqualad (Khary Payton)
- Dick Grayson/Robin (Jesse McCartney) - 15-years old, now being informed to grow out of Batman's shadow and become his own hero as Nightwing
- Wally West/Kid Flash (Jason Spisak)
- Connor Kent/Superboy (Nolan North) - he and M'Gann knew Mal and Karen, and when they found out about Mount Justice, they revealed who they are
- M'Gann M'orzz/Miss Martian (Danica McKeller)
- Artemis Crock (Stephanie Lemelin) - her outfit is mainly her first season outfit combined with Tiger Stripes.
- Zatanna Zatara (Lacey Chabert)
- Raquel Ervin/Rocket (Cree Summer)
- Garth/Tempest (Yuri Lowenthal)
- Tula/Aquagirl (Cree Summer)
- Donna Troy/Troia (Lacey Chabert)
- Freddy Freeman/Lieutenant Marvel (Daryl Sabara)
- Mary Batson/Sergeant Marvel (Rachel Lillis)
- Barbara Gordon (Alyson Stoner)
- Jason Todd (Crawford Wilson)
- Karen Beecher (Masasa Moyo) - when she realized M'Gann was a Martian, was shown her White Martian form, she was quite surprises but more polite.
- Mal Duncan (Kevin Michael Richardson)
- La'Gann (Yuri Lowenthal)
- Garfield Logan (Logan Grove, Dee Bradley Baker in Werebeast form) - having been deranged ever since his mother was killed by Queen Bee, he started losing control of his powers turning into a Werebeast to find and kill Queen Bee
- Justice League:
- Superman (Nolan North)
- Batman (Bruce Greenwood)
- Wonder Woman (Maggie Q)
- Aquaman (Phil LaMarr)
- Flash (George Eads)
- John Stewart (Kevin Michael Richardson)
- Martian Manhunter (Kevin Michael Richardson)
- Captain Atom
- Green Arrow
- Black Canary (Vanessa Marshall)
- Red Tornado (Jeff Bennett)
- Captain Marvel (Chad Lowe)
- Dr. Fate
- Hal Jordan
- Plastic Man
- Brainiac (Jonathan Frakes) - the main antagonist of the film, encounters the Team, and is fought by the future members of the Team, his goal is to consume the core of Earth's knowledge as he did Krypton.