First of all...

I DO NOT OWN ROBIN OR ANY DC CHARACTERS. NOR DO I OWN DC COMICS, YOUNG JUSTICE, OR TEEN TITANS.

Ok now that that is out of the way. Let's move on.

This theory is a theory I had when I was watched Teen Titans after I had watched Young Justice. Me, being the roleplayer and writer I am, made a story where it added in Sara Grayson, Robin's twin sister. (If you wanna see a fanfic of this... TELL ME!) Except I had added her to both the Young Justice world AND the Teen Titans world. Now me, being the theory creator I am, I created a theory to interlink these possibly two unrelated worlds. Now this is not counting 'Titans Go!' Titans Go! Is it's own universe... I have already decided that.

Now the theory is that the first season of Young Justice came before the entire Teen Titans series (And movie) and then came in the second season of Young Justice.

The first season of YJ involved Robin still being Batman's sidekick and being in the group with the others. He also ends up staying in the series that he doesn't want to be the Batman anymore, like he previously did. SOOO after the first season ended he ran away to Jump City, in which he formed the Teen Titans. When Kid Flash came along, I took this as Wally coming to look for him and becoming an honorary teen titan and not telling anyone about Robin's wearabouts. Yes his moves are different but I moved that aside.. It was something much smaller that didn't affect the theory THAT drastically. Later, on the first episode of the second season of TT we see that Robin becomes Nightwing (With overly long hair I want to punch him in the face for growing.) That brings us to Season two of YJ. Robin is back after the Justice League called and asked for him to come back because they needed his help and he then ended up joining (as well as Beastboy) under the name Nightwing. Beastboy is now Miss M's little adoptive brother. And talked about what power he would get if he spilled more chemicals on himself. Well I think that Miss M took him as her little brother when Nightwing got so caught up with League stuff after he disbanded the Teen Titans and BB felt lonely. And I think that the tail came from a delayed side effect of the chemicals beast boy spilled on himself in Teen Titans.

Welp... That's it! Tell me if anything confuses you and by the way if you are currently reading my 'The Eight Heroes' book... I'm going off of this theory for Robin. So keep that in mind!