^Well, almost all the TNG cast has voiceover experience: Stewart, Frakes, Sirtis, Dorn, Spiner, Burton, and Wheaton. Indeed, I think Dorn has done more voice roles than on-camera roles over the course of his career. In DS9, Auberjonois had abundant voiceover experience long before he was Odo, Brooks and Meaney have done occasional voice work, and Shimerman has recently been getting into voice acting big time. In VGR, Mulgrew and Picardo have substantial voice-acting experience, Phillips has done a little video-game voice work, Dawson did a little voiceover work on Trek (doing computer voices in VGR: "Dreadnought" and ENT: "Dead Stop"), and Lien lent her gorgeous voice to several animation roles some years back, though she seems to be retired from acting these days.