Shatner has announced three upcoming concerts in California where he will be backed on stage by Circa, the prog rock band that features former Yes members Tony Kaye and Billy Sherwood.

Sherwood produced and co-wrote the music on Shatner's new prog album, "Ponder The Mystery" which will be released on CD and vinyl formats on October 8th.

The also features guests appearances from a who's who of rock, prog and country including Rick Wakeman, Al DiMeola, Steve Vai, Robbie Krieger, Vince Gill, Edgar Winter, George Duke, Zoot Horn Rollo and Dave Koz.