Unless the entire cast suddenly found it hard to make their mortgage payments, file this one under “unnecessary sequels.” The passage of 23 years finds Begbie (Robert Carlyle) on the lam, Spud (Ewen Bremner) a suicidal junkie, and Simon (Jonny Lee Miller) managing a questionable extortion ring — when he’s not tending bar and snorting coke. The brains of the organization (Ewan MacGregor) is still running, only this time it’s at a health club. The opening gag involving a stalled treadmill flashes a warning sign that a lightweight comedy reunion lies ahead. As a courtesy to its forerunner, screenwriter John Hodge works in a few gross-out jokes. The least offensive crudity involves a sparkling porcelain commode, a reverse reference to the original’s most memorable moment. Director Danny Boyle (Millions, Slumdog Millionaire) is simply too nice a guy to work against his minions. Following closely in the footsteps of its predecessor, T2 is the second sweetest film ever made about a caboodle of heroin addicts. (2017) — Scott Marks