LEONARD NIMOY'S PRIMORTALS: INTERACTIVE COMIC BOOK AND REFERENCE GUIDE;THE ADVENTURES OF BATMAN AND ROBIN ACTIVITY CENTER

LEONARD NIMOY'S PRIMORTALS: INTERACTIVE COMIC BOOK AND REFERENCE GUIDE (Sierra On-Line/Big Entertainment, CD-ROM for PC and Mac, $19.95) THE ADVENTURES OF BATMAN AND ROBIN ACTIVITY CENTER (Gryphon, CD-ROM for PC and Mac, $49) Based on Leonard Nimoy and the late Isaac Asimov's comic books about humanity's ''first contact'' with aliens who descended from dinosaurs, Primortals cranks up gorgeous 2-D artwork with cushy multimedia embellishments: Graphic frames cohere in a fluid, animated slide show accompanied by a groovy techno-pop soundtrack; the narrative unfolds from four character perspectives (human and alien); and the hyperlinked ''Tekno'' arena divulges strange stats on the real-life SETI (Search for Extraterrestrial Intelligence). Where Primortals appeals to the imaginative kid in everyone, Batman and Robin, based on the current TV cartoon series, talks down -- even to children. Tykes collect crime-solving clues by exploring a piddling three screens (Batcave, Wayne Manor, Gotham City), playing mind-numbing games (crack a code by doing, ugh, lots of multiplication), and withstanding Robin's grating, gung-ho narration. Primortals: A- Batman and Robin: C