And it's a lot of fun, especially as Robin has changed: it's a new Robin to the Turtles, and they can't seem to get over that fact!   I laughed out loud a couple times, but overall, this is the same as the rest of the series: the art isn't good enough to warren the last of the five stars, and it's fun, but not a favorite of mine.  

It was nice catching up with the Gotham crew later and seeing how they evolved, and how the newbie reacted to the giant turtle-men.   So I'd give it a reread, but probably not in the next couple of years. 

Issue six is an epilogue: it takes place after, it takes place in Gotham rather than the in the Turtles' universe, and it takes place a good deal while after from what I can tell.   Still, this issue, five, ends up wrapping up the portal storyline with a twist.  

It's fun, it used a character I didn't expect to be the brains behind this operation, and I liked it enough to reread in the future even if it's not a complete favorite mini-series, or crossover.

Another of my favorite Batman villains.   Then again, he gets such good villains!  

Still not my absolute favorite, but I'm still enjoying this.  It's weird fan service, and I'm into that in general. 

I do miss her relationship with Harley, which was, true, more explicit in the comics than the TV show.   (This was on sale on Comixology recently, under their all-age sale, and I don't regret the buck I spent on each issue.   Gotta admit: I'm more excited about a possible Inhumans sale for the IMAX movie and later the TV show premiere at the end of September.)

Anyway, I love what they did with Poison Ivy and how everyone worked together to send her back to Arkham.   

Still not crazy about the art, and still not finding this the very best crossover, or even media tie-in, that IDW has produced.   (The Ghostbusters/TMNT and Edward Scissorhands ones were WAY better.)