Santa Claus Conquers the Martians

Martians send kidnappers to Earth to capture dear old Santa. Upon their arrival on Earth, they are terribly mixed-up when they see hundreds of Santas, but eventually two darling children lead them to the "real" Santa Claus. Unfortunately, the Martians decide to capture the two children as well and return them to Mars where there is no Christmas and where the bored Martian kids can do nothing but watch Martian TV! The film includes the (then) child star, Pia Zadora, appearing as a Martian kid..