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Sean Astin, Kal Penn to guest star on 'Big Bang Theory'
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Big Bang Theory Season 12 Casts Sean Astin & Kal Penn
Kal Penn And Sean Astin To Guest Star On 'The Big Bang Theory'
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The Big Bang Theory' Adds Sean Astin & Kal Penn as Guest Stars
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Sean Astin, Kal Penn to guest star on 'Big Bang Theory' - UPI.com
