Undine

Undine, played by actress Sivi Aberg, is the hench-girl to the Joker in the third season episode of the Batman live action tv series "Surfs up, Joker's under.".

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the plot concerns the Joker's attempt to become surf champion of Gotham, in order to profit by it. To this end the Joker uses a device to steal another surf champ's skills. However his plot is foiled by Batman Robin and Batgirl, Batman defeating the Joker in a surf contest, leading to the capture of the clown prince of crime and his gang.

Undine, a blonde in a white bikini, works undercover for the Joker at the Hang 5 surfers joint. She helps him get rid of a surf board designer and to kidnap the surfing ace Joker wants in order to steal his surfing abilities.

Unlike some of the other female helpers of arch criminmals in the series, Undine comes over as a hardened criminal. In helping Joker to capture his victims she clearly gets a kick out of the caper and she relishes the caped crusaders being pierced with spines by Joker's hench-men. She is captured at the end along with the Joker and his men.