Discovery "Muddled Reflections" - The crew of the Discovery enroute to pick up their new captain receive a distress call from a disabled shuttlecraft where they find Harry Mudd - from the Mirror Universe! A bumbling assistant-to-the-Rebel sympathizer, Mudd seeks asylum aboard Discovery just as Captain James Halpert of the ISS Dunder-Mifflin jumps in with it's displacement-activated-beets-hub drive, demanding the immediately surrender of the traitorous Mudd for crimes against the Empire.
Voyager - "Promotions" - Ensign Kim finally receives a promotion to Lieutenant. However, as soon as the rank pip is applied to his collar, a half-Borgified Kazon named Maj Tiberius-Augustus Picard, a visitor from the future materializes through an Iconian gateway, and warns that promoting Harry Kim will lead to a series of catastrophic events that will cause the downfall of Starfleet, the crumbling of the Federation, and inevitably the destruction of the entire universe. In an effort to maintain existence for all, Harry Kim is demoted back to Ensign. Special Guest Star Patrick Stewart as his descendant Maj Tiberius-Augustus Picard.