Watch The Ultimatum: South Africa

The moment of truth is here. Participants make profound choices about love, commitment and their futures.

Time is almost up for the couples, whose reflections on the nature of love and commitment raise questions about their relationships' viability.

Reunited with their original partners, couples sift through their experiences and consider their futures together.

As the experiment draws to a close, heartfelt moments contrast with tense confrontations, leaving several couples with tough choices to make.

When family weigh in, couples face tough truths. A surprise twist at a group gathering sends shockwaves, testing every union.

Some of the couples find difficulty letting go of their past, which strains their new arrangements.

A trial marriage forces the couples to consider whether to stay loyal to their original partner or test the waters with a new love interest.

At a cocktail party, the couples make critical choices, setting the stage for deeper connections and more emotional revelations.

Emotions run high as couples prepare for a transformative journey exploring new romantic partners -- and potentials.