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2004 • 6 Episodes
Season 1 of Junior Mastermind premiered on August 30, 2004
2005 • 6 Episodes
Season 2 of Junior Mastermind premiered on May 15, 2005
2006 • 6 Episodes
Season 3 of Junior Mastermind premiered on January 26, 2006
2007 • 6 Episodes
Season 4 of Junior Mastermind premiered on January 8, 2007
2007 • 5 Episodes
Season 5 of Junior Mastermind premiered on December 10, 2007