‘Lightyear’ goes to infinity, but not beyond, in a likable offshoot of ‘Toy Story’

The most interesting aspect of “Lightyear” is dispensed with in the first 15 seconds, when it’s explained how and why you’re watching a movie devoted to the action-figure character from “Toy Story.” After that, the movie works primarily as a fairly likable action vehicle mixed with a familiar rumination on what defines a life, without rising into that top tier of Pixar fare its predecessors occupied.