Here's Lucy (1968)

S4E23 With Viv As a Friend, Who Needs an Enemy?

Viv makes an unexpected appearance, announcing to Lucy that she could stay in California for a year. However, chaos ensues when Harry dismisses Lucy and replaces her with Viv, leaving Lucy fuming. As time passes, Harry grows increasingly frustrated with Viv, who feels the same about him. In a bid to get Viv to leave, Lucy devises a plan, but Kim accidentally spills the beans to Viv. Ultimately, everything returns to how it was before, with no lasting changes.