Tiny, lime-green Mikey (voiced by Billy Crystal) and big, blue Sulley (John Goodman) are back together again in this prequel to the 2001 Pixar hit Monsters, Inc. The movie introduces us to how Mikey and Sulley met during their freshman year in college and studied to be the master scarers they eventually become. Speaking of scares, there aren’t too many in this lively, colorful, family-friendly comedy; my son, Nicolas, was 3 ½ when I took him to see this and he did just fine. The dean of the scaring school — an intimidating, centipede-like creature voiced by Helen Mirren — might frighten the littlest viewers as she swoops through the air and then scampers about on her sharp claws. The rest of the monsters are goofy, or furry, or squishy, and thoroughly adorable and clever.