John Boyd - who appeared in the Fox thriller's eighth season - will play the brilliant mathematician Kase, according to The Hollywood Reporter.
Kase is a college friend of entrepreneur and scientist Calvin Butterfield, played by fellow 24 veteran Lukas Haas.
Inception star Dileep Rao will also join Touch for season two. The 39-year-old Avatar actor has been cast as Vikash Nayar, a wealthy man with connections to sinister organisation Aster Corp.
Stars already signed up to appear on Touch include Ayelet Zurer (Man of Steel), Saïd Taghmaoui (Lost), Adam Campbell (Harper's Island), Ray Santiago (Raising Hope), Saxon Sharbino (I Spit on Your Grave) and Greg Ellis (Pirates of the Caribbean).
The series returns to Fox, in a new Friday timeslot, on October 26 at 8/7c. Sky1 is also expected to air the new season from October in the UK.
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Watch a clip from the Touch season one finale below: