Spock is reunited with Leila Kalomi (Jill Ireland) in ""; after joining an away team to the planet Omicron Ceti III. After being affected by planet spores, Spock begins showing emotion and re-initiates his romantic liaison with Kalomi. The impact of the spores on him is cured after Kirk goads him into anger, and once freed of the effects, Spock is able to initiate a solution which cures the rest of the crew. Spock attempts to mind meld with a non-humanoid Horta in "The Devil in the Dark", having initially suggested that Kirk should kill the creature. Following a second mind meld, Spock relays the history of the Horta and is able to create peace between the aliens and a nearby colony. Both Spock and Kirk undertake guerrilla warfare against the occupying Klingon forces on the planet Organia, prior to the establishment of the Organian Peace Treaty in "Errand of Mercy". To restore the timeline, he travels with Kirk back to 1930's New York City in "The City on the Edge of Forever". He uses technology of that period to interface with his tricorder over the course of the weeks they spend in the period before witnessing Edith Keeler's (Joan Collins) death.