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The second episode of Justice League is called "Secret Origins Part 2."
No
If you are talking about the character from folklore, no, he is not in the Justice League. However, Green Arrow, the guy that LOOKS like robin hood, was formerly part of the Justice League.
yes
the two-part episode "A Better World".
Justice League - 2001 Metamorphosis Part II 1-23 was released on: USA: 11 October 2002
Justice League - 2001 Starcrossed Part III 2-26 was released on: USA: 29 May 2004
Justice League - 2001 Twilight Part II 2-2 was released on: USA: 5 July 2003
Justice League - 2001 Legends Part II 1-17 was released on: USA: 28 April 2002
Justice League - 2001 Hereafter Part II 2-20 was released on: USA: 29 November 2003
Wonder Twins, the were part of the Justice League.
Justice League - 2001 The Savage Time Part II 1-25 was released on: USA: 9 November 2002