Poison Ivy has teamed up with Jason Woodrue, the Floronic Man, and Batman and Nightwing need to know how to find and stop them before anyone else gets hurt. That means recruiting the reluctant assistance of Harley Quinn, who has tried to leave behind her life of crime and is working at a sleazy superhero-themed bar, posing as ... herself.

The vegetative villains plan to convert all of humanity into mammal/plant hybrids, which is even a little too crazy for Harley, so she comes along for the ride -- after seducing Nightwing -- because she's afraid no one will water her.

The off-screen sex scene between Nightwing and Harley feels a little unnecessary and, although I'm no prude, I'm not sure it's appropriate for a movie you know kids are going to watch. (It's not quite as obvious as Harley and Deadshot's tryst in Batman: Assault on Arkham -- Harley, post-Joker, apparently gets around -- or Batman's out-of-character encounter with Batgirl in The Killing Joke. In any case, parents be warned.)

The movie stars fan-favorite Kevin Conroy as Batman, Melissa Rauch as Harley, Loren Lester as Nightwing, Paget Brewster as Poison Ivy, Kevin Michael Richardson as the Floronic Man and John DiMaggio as Swamp Thing.

Batman & Harley Quinn is a mixed bag, with fart jokes, a henchman dance club and karaoke bar, some clever dialogue and a few cute visual cues harkening back to past features (including the TV series with Adam West). It also does a good job of showing both Harley's crazy and sentimental sides, with a rare Harley Quinn vs. Poison Ivy fight.

Poison Ivy: I thought you were my friend.
Harley Quinn: Friends don't let friends kill 7 billion people.

There are some subtle but surprisingly funny Batman moments, and you have to love the moment when Harley -- who was, before turning to a life of crime, a fully licensed psychiatrist -- sets Batman straight on the difference between "sociopath" and "psychopath." (She's the former, Joker is the latter.)

As usual, the film provides a never-ending supply of police officers who are killed in the line of duty and pass unremarked, although the heroes show an unusual amount of remorse for a scientist who dies along the way.

A lot of Batman "fans" have complaints about this one, but then again some "fans" these days always seem to have complaints about their particular fandom. No one wants anyone else to enjoy things these days. Ultimately, Batman & Harley Quinn is a fun little outing with some popular characters. There's nothing groundbreaking here, nothing that sets a new bar for DC's animated library, but it's not offensive, and it's certainly not bad. It entertains, which sometimes is enough.