23:30The Apprentice USACelebrity Apprentice 4Episode 4: Off the HookBBC One Duration: 1 hour, 20 minutes Sun 25th Jan 2015, 23:30 on BBC One Northern Ireland HDDonald Trump presents the American version of the business-based competition. The celebrities must produce a commercial for a new video phone.ContributorsParticipant:Donald TrumpGenresFactualFormatsRealityBrandThe Apprentice USASeriesThe Apprentice USA: Celebrity Apprentice 4 Source: BBC Online