Rupert Grint and Toby Kebbell chat with ET's Lauren Zima about season 3 of 'Servant.' Both actors reflect on how being fathers has influenced their performances on the psychological thriller series, which has already been renewed for a fourth season. Grint teases 'Harry Potter 20th Anniversary: Return to Hogwarts' on HBO Max, and shares his excitement for reuniting with Daniel Radcliffe and Emma Watson. 'Servant' premieres Jan. 21 on AppleTV+.
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