(CNN) "Deadwood" was one of HBO's greatest dramas, before coming to an abrupt end in 2006 -- after just three seasons -- due to a dispute between the network and series creator David Milch. "Deadwood: The Movie" provides a welcome if bittersweet, characteristically foul-mouthed reunion, one that more than justifies saddling up the entire gang for one more ride.

Written by Milch, whose recent revelation that he has been diagnosed with Alzheimer's disease adds a sobering note to the proceedings, the plot acknowledges the passage of time, as folks assemble in Deadwood, S.D. -- a near-lawless territory when the series began -- for a statehood celebration in 1889.

Most of the residents remain in place, having enjoyed some upward mobility in the intervening years, including saloonkeeper Al Swearengen (Ian McShane), who is experiencing the ill effects of his licentious lifestyle; and Marshal Seth Bullock (Timothy Olyphant), who has settled into domestic life with his wife Martha (Anna Gunn), after a rocky start to a marriage entered into out of duty to his late brother.

The festivities, however, bring back two personalities that threaten to unsettle things, in different ways: Alma Garret (Molly Parker), the steely heiress with whom Bullock exchanged smoldering looks, and then more; and robber baron George Hearst (Gerald McRaney), whose ascent into Congress as a senator from California hasn't quelled his appetite to use Deadwood to further enhance his fortune.

As usual, it takes a little time to get reacclimated to Milch's dense period language, and the poetry found within lines of dialogue like the need to exhibit grace, "no matter the provocation by lesser or evil men."

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