When Katie’s mentor and dear friend Tami moves to Westport, Katie wastes no time introducing her to her “A Real Mother” vlog viewers. Meanwhile, Taylor discovers Greg has been keeping an entertaining secret.

A mishap on the aerial ladder in the midst of a fire rescue leaves Mouch shaken and questioning his abilities. Kidd looks for support from Severide. Casey and Brett discuss their future.

Naomi makes a desperate attempt to save her son from Marco. On the Roci, Holden battles for the last sample of protomolecule.

Jimmy asks The Roots to improvise songs about audience members in an all new Freestylin’ with The Roots, then chats with Riz Ahmed and Angela Bassett before welcoming musical guest Jacob Collier featuring Mahalia.

It's Election Day in Kattegat and all eyes are on the voting, but strangers arriving at the harbor may force a very unexpected outcome. Ivar receives the signal from Prince Dir that his forces are ready to challenge Oleg.