The tour extension follows a three-week run this year at Broadway's Music Box Theatre and a successful tour of 15 cities across the United States.
"Performing for audiences on the road has been one of the most gratifying experiences I've ever had as an actor," Shatner said in a statement Tuesday. "My fans are the best in the world and I can't wait to get back on tour this year."
The 90-minute show takes audiences on "a voyage through Shatner's life and career, from Shakespearean stage actor to internationally known icon and raconteur, known as much for his unique persona as for his expansive body of work on television and film," a synopsis said.
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