Season three, episode ten of This Is Us dropped several bombshells last night (Randall’s win! John Stamos! Toby’s gift to Kate!). But some major plot details were revealed more subtly. Take, for instance, the key piece of information Kevin (Justin Hartley) and Zoe (Melanie Liburd) found hiding in a box of Jack’s (Milo Ventimiglia) old belongings.
When Zoe and Kevin were unpacking boxes in their new shared home, she came across a postcard addressed to Jack from someone named “C.K.” Earlier in the episode, they learned that Uncle Nick (Michael Angarano) had signed his psych ward release papers Clark Kent. So, when they saw a postcard that read, “Jack, last one,” and signed “C.K.” they knew it was from Uncle Nick.