Warning! SPOILERS for Young Sheldon season 5, episode 4
Young Sheldon season 5 answers a lingering question about Sheldon's (Jim Parsons) first roommate in The Big Bang Theory. Before Leonard (Johnny Galecki) moved into Apartment 4A, the socially inept genius was rooming with a different person named Sebastian (Steven Yeun). Not much is known regarding their setup, but a key detail of their history is explained in Young Sheldon season 5, episode 4 titled «Pish Posh and a Secret Back Room.”
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