Common plays Robert Sims, a janitor's son who rose to head of Judicial security and executes the regime's will - even as he begins to question it. The S2 finale's IT/Algorithm turn sets up a major Season 3 power struggle around him, his wife Camille, and their son Anthony. After S3E4 the fan read flips: he appears to be secretly working around the Algorithm.
The community's biggest S3 pivot: with Bernard revealed alive, fans read Sims as having faked the execution, hidden Bernard, and possibly placed Nurse Amy to protect Juliette - a double agent hiding it all from Camille. Note the on-screen ambiguity: he still corners Juliette in S3E4, so whether he acts for Juliette, for Bernard, for his son, or for the silo's survival is unresolved.
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