Chicago – Though Benedict Cumberbatch has been delivering fine work in film and television for the past decade, he hadn’t received a great deal of attention until last year, when he played strikingly diverse characters in Oscar bait such as “War Horse” and “Tinker Tailor Soldier Spy,” while earning legions of fans on BBC’s “Sherlock.” He’s such a deft chameleon that it’s easy for audiences to overlook his formidable body of work.

Rating: 3.5/5.0

In Hattie Dalton’s “Third Star,” which is currently available via On Demand, Cumberbatch delivers the sort of performance that would be considered a Best Actor front-runner this awards season—had it been delivered by George Clooney. As James, a 29-year-old man stricken with cancer, Cumberbatch is utterly wrenching without ever once settling for easy clichés. Though he says early on that, “The sickness may be mine but the tragedy is there’s,” referring to his loved ones,...