Star-Crossed Mondays, 8 p.m., the CW.

Aliens have come to Earth in Star-Crossed, but this is a CW show, so the aliens look exactly like attractive humans, except with a few tattoo-like markings. The laziness of the depiction of aliens is just one of the failings of Star-Crossed, which tries to build a Twilight-like love triangle by substituting aliens for vampires. Again, this is the CW, so the main alien and human characters are teenagers, the first class to be integrated in a public high school.

That might make it sound like the show has some social commentary up its sleeve, but any political relevance takes a backseat to teenage romantic longing, clumsy exposition and forced melodrama. Leads Aimee Teegarden and Matt Lanter both look way too old to be playing naïve teenagers (Lanter is 30), and their weak chemistry can’t overcome the awkwardly written love story. Neither sci-fi fans nor swooning Twi-hards are likely to be satisfied.