A... Scoobyverse?

 

This is not a real thing, but I kinda wish it was.  I enjoyed the Titans crossover with the Titans movie, they did some really clever bits, though I wish they had acknowledged all the other Titans that have been in the group.  Oops, I have digressed yet again.  Be that as it may, once again, this does not exist.  It could really work, though, since the two big bads would pretend to work together at first and cross universal boundaries.

Teen Titans go vs Teen Titans (2019)

 

The Teen Titans Go team gets brought to an intra-dimensional game board by the Gamesmaster Master of Games to battle some other universe's Teen Titans. The long game is that The Master, who is Trigon in disguise, wants Go Raven's demon soul.  Go Trigon is helping original Trigon accomplish this.  Both Ravens end up with both Trigons, and the two teams have to get along to find their friends before Trigon can become real again.  This leads to crossing over to many universes and seeing meeting many other versions of the Titans (always the same members, no Wonder Girl, Aqua Lad, Speedy, etc).  Finally Raven accepts her demon side (shades of The Wizard of Earthsea) and every one says goodbye.

Young Justice

This is a series about several of the "sidekicks" of the major DC heroes.  It is definitely not the Teen Titans, though it sure starts out that way.  Speedy, Robin, Kid Flash and an Aqualad I've never seen before are teamed up with Artemis (not Arrowette) and Miss Martian and the clone Superboy.  Speedy, I mean Red Arrow, shows up occasionally so far.  At least he got rid of that dumb name. The show is about them becoming more than sidekicks, true heroes in their own right.  Naturally, they fight various villains along the way and have personality struggles with both their adult counterparts and each other.  The JLA is seen occasionally, and J'onn's all black costume... can we be over everyone wearing black these days?  It's a pretty classic lineup of the JLA, Hal, Katar and Shayera, Green Arrow and even Captain Marvel... this is Earth-16, so I guess that can make sense.  I still think Cap is best used in a humorous hero vein, rather than as a "serious" hero, but no one asked me, did they?  In season 2 more young heroes show up, including one that's obviously missing from this mix, Wonder Girl.