Naomi Ackie dazzles as Whitney Houston

 As a biopic, director Kasi Lemmons’ Whitney Houston: I Wanna Dance With Somebody breaks little new ground. If you're familiar with Houston's story, you may not find many surprises. 

 Moreover, two  documentaries -- Nick Broomfield's Whitney: Can I Be Me and Kevin Macdonald's Whitney -- already have covered some of the same ground. 

  Happily, though, that's not the whole story. 

  Lemmons approaches the movie with an obvious love for Houston's work -- and a willingness to put plenty of it on display.

   I Wanna Dance With Somebody may not be a great movie but it boasts a terrific, star-making performance from British actress Naomi Ackie. 

   Ackie doesn't look like Houston but she projects the singer's undeniable power -- as an up-and-coming New Jersey kid, as an established star, and as a drug-addicted woman caught in a destructive celebrity spiral.

 Houston's voice was dubbed into the movie. Ackie may not be singing but she nails the songs as bravura performances. By the end of the movie, Ackie has so fully absorbed Houston's style that her work ranks as a memorable achievement.

   Of the supporting cast, Tamara Tunie has an impressive turn was Whitney's stage-mom mother; a stern Clarke Peters plays her controlling dad, and Stanley Tucci turns down the volume to portray Clive Davis, the record mogul who discovered Houston. 

   Written by Anthony McCarten, who also wrote Bohemian Rhapsody, which told the story of Freddie Mercury, the film samples Houston's off-camera life, including the developing conflict between Houston's husband Bobby Brown (Ashton Sanders) and her best friend and one-time lover Robyn Crawford (Nafessa Wiliams).

   Thankfully, Lemmons spares us the sight of an overdosed Houston who was found dead in a bathtub at a Beverly Hills hotel in 2012.  

   Lemmons sets us up for that scene near the movie's end but only implies it. Instead, she flashes back to a recreation of Houston's performance at the 1994 American Music Wards. Houston sings sang three challenging tunes: I Loves You Porgy, And I Am Telling You I'm Not Going, and I Have Nothing.

    The scene becomes a statement about all that was lost with Houston's death. Lemmons allows Houston to write her own musical epitaph, and I Wanna Dance With Somebody brings Ackie to the spellbinding moment she's earned.

Harriet Tubman reaches the screen

Cynthia Erivo gives one of the year's most compelling performances in director Kasi Lemmons' Harriet.

In Harriet, actress Cynthia Erivo comes across as a determined female warrior who battles the evils of slavery, freeing as many enslaved people as she can. With a face full of fury, Erivo creates a portrait of flinty resolve and unshakable faith. Tubman, who escaped slavery at the age of 27, became a "conductor" -- someone who guided the enslaved to freedom -- on the Underground Railroad. She already had won her freedom but wasn't satisfied, not when so many others were left behind to suffer.

As directed by Kasi Lemmons (Eve's Bayou and Talk to Me), Harriet paints a portrait of a woman who came to realize she had only one choice: Be free or die. Once Tubman decided that she'd rather be dead than enslaved, everything else followed.

In Maryland, Tubman was known as Minty. She grew up on a plantation and watched a sister being sold away from the family, an event that permanently scarred her, as did the lashes from the whips of slave masters.

Determined to flee, Tubman made a journey of 100 miles -- from Maryland to Philadelphia. She traveled alone.

Erivo creates a portrait of a woman possessed. Tubman was struck in the head as a child, an event that some say accounted for the religious visions that she claimed to have. Erivo's fierce portrayal leaves little doubt that if Tubman said she talked to God, you'd best believe her. She's like an American Joan of Arc. Employing a different religious reference, frustrated plantation owners dubbed her "Moses."

Part action hero and part American icon, the Harriet that emerges on screen kicks butt and, yes, that's satisfying, given the people whose butt she's kicking. A born leader, she refuses to allow anyone (even the politically cautious abolitionists she meets in Philadelphia) to define her.

The evil white slavers find their fullest representation in a character named Gideon Brodess (Joe Alwyn),
a severe slave master who won't rest until he returns Tubman to his plantation. At one point, he hires black slave hunters to help him in his quest. Gideon's mother (Jennifer Nettles) can be even worse, a hysterical woman who sees her beloved plantation sinking deeper into debt.

The movie's Philadelphia setting produces the movie's strongest supporting characters. Janelle Monae plays a woman who owns a boarding house and Leslie Odom Jr. portrays an abolitionist who introduces Tubman to the Underground Railroad. At various points in the movie, Clarke Peters appears as Tubman's father.

Lemmons sticks pretty much to surface, and, at times, Harriet seems more of an action movie than it needs to be. Put another way, Harriet sometimes feels more attuned to the demands of contemporary moviegoing than to rhythms that would have been more reflective of the period in which Tubman lived.

With Harriet, what you see is what you get and the movie emerges as a kind of primer on Tubman's life that's built around a compelling performance. I agree with those who think it should have been more than that, but Lemmons' big-screen biography sets its own terms and lives within them.