“Batman vs. Teenage Mutant Ninja Turtles” (** out of four) was a serviceable animated action saga about Batman (voiced by Troy Baker), Batgirl (voiced by Rachel Bloom), and Robin (voiced by Ben Giroux) who all realize they must form an alliance with the Ninja Turtles to stop The Shredder (voiced by Andrew Kishino) who has become a deadly threat to Gotham City, especially after he teams with Ra’s Al Ghul and The Penguin (voiced by Cas Anvar and Tom Kenny). Overstuffed plot has too many characters and wears thin after a while but features enough action and colorful animation to keep series fans and kids entertained. Mildly OK for what it is.