Lois & Clark: The New Adventures of Superman (1993)

S03E04 When Irish Eyes Are Killing

Lois seeks to persuade Clark that ending their relationship is the wrong choice. An old friend of Lois arrives in Metropolis, attempting to stir jealousy in Clark. However, this friend has sinister intentions, planning to involve Lois in a Druidic ritual. As Clark comprehends that life without Lois is unbearable, he may discover that his realization comes just in time to be too late.