The Tenth Doctor > Donna Noble > River Song > Vashta Nerada
The Runaway Bride finally gets herself a husband and takes care of cookie-cutter kids in Star Trek Generation’s “Nexus”.
A tonne of foreshadowing and a very common courtesy unit, plus the very first appearance of Professor River Song (on our timeline)
The Twelfth Doctor > Nardole > River Song > Shoal of the Winter Harmony
A pointless sidekick, an inconsistent robot and a massive get-out-of-jail-free card. Fun!