''Stupid,'' my 6-year-old son declared, predictably, after watching the first several minutes of Barbie and the Sensations, Rockin' Back to Earth. It is an accurate assessment. The story begins when Barbie (based on the doll of the same name) and her rock band, the Sensations, conclude a concert in space and head back home. On the return trip, they get sucked into a time warp and wind up on Earth in 1959. The band hangs around long enough to suit up in poodle skirts and saddle shoes, and knocks everyone out with its tunes.
Then a clever scientist discovers that a confluence of chords in the band's music and the alignment of planets will create the synergy to propel the group through time. The plot is extremely silly, and there's nothing else in the video to help it along.
Barbie and her friends are one-dimensional; their most moving lines are ''You got it!'' and ''Don't you forget it!'' The animation is carelessly executed; the characters move like robots, which gives them a zombie-like quality consistent with their personalities. And the music is the aural equivalent of stale bubble gum. F