Can polished, entertaining sci-fi effectively be delivered on a shoestring budget and under a tight shooting schedule? If writer-director Zach Clark’s “The Becomers” is any indication, the answer is a resounding “yes.” Add to this ambitious mix a sharply written story and script, skillful film editing, an innate quirkiness, a wry satirical bent and inventive, impeccably timed humor, and viewers haver mais...