Minor caveat: He technically helps the firm on a few cases before Episode 10, but his official return as an associate happens in S6E10.
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If you’re watching Suits and wondering whether Mike Ross returns to Pearson Specter Litt (as it’s called in Season 6) after getting out of prison—here’s the short answer:
Does Mike go back to Pearson Specter in Season 6? (No major spoilers beyond the answer)