* “Shore Leave” — The U.S.S. Enterprise crew visited another shore leave planet in this Original Series episode, while for Starfleet crews in “Captain’s Holiday,” “Let He Who is Without Sin…,” and “Two Days and Two Nights,” among others.
** “Amok Time” and “Kir’Shara” — Vulcan lirpas have appeared previously in episodes such as the Original Series classic and utilized in this Enterprise episode as energy weapons were useless in the Forge. Erica Ortegas also previously noted she sustained scars after getting in the middle of a Vulcan relationship and its subsequent fight that included a lirpa in “.”
*** “The Andorian Incident” — T’Pol notes that she was given a nasal numbing agent to tolerate the human smell aboard the NX-01.
**** “” and “” — Pike experiences a deadly encounter with the Romulans in this alternate timeline, while La’An’s accidental time-travel takes her into a time when the Vulcans are losing in a war with the Romulan Star Empire.
***** “Amok Time” — Christine Chapel makes plomeek soup for Spock, also to disastrous results, as he was undergoing pon-farr. Plomeek soup and broths were also a stable aboard the NX-01 and Voyager for their Vulcan crew, and enjoyed by the crew stationed at Deep Space 9.