Twenty-five years after the September 11, 2001, terrorist attacks on the United States, questions about the backgrounds and motivations of the hijackers remain unresolved. A new documentary delves into thousands of recently declassified documents that some experts believe suggest possible Saudi government involvement. At the center of the controversy is Omar al-Bayoumi, a Canadian-Saudi businessman who has been accused of acting as a liaison between the Saudi government and two of the 9/11 hijackers. Both al-Bayoumi and the Saudi government have denied the allegations, but the newly released records have reignited debate about the events leading up to the attacks. In a lighter tone, the final season of the Australian comedy Colin from Accounts returns to BBC Two at 10pm. The show, which follows the life of Colin, a man working in accounting, has taken a more somber turn since the previous season. Gordon, the main character, is dealing with the aftermath of a failed relationship and a struggling business, while Colin seems to be on more stable ground. A chance meeting brings Colin and Gordon back together, reigniting old feelings but also forcing them to confront unresolved issues. Despite some plot twists, the series maintains a heartfelt and realistic balance between comedy and drama, with strong chemistry between the actors. Meanwhile, PH Fred’s Ultimate Hotels continues on Channel 4 at 8pm, following Fred from the First Dates restaurant as he explores luxury accommodations around the world. This week, he finds himself in a South African safari lodge, where he helps the staff prepare a traditional "bush braai" barbecue. The episode also includes a thrilling encounter with an elephant, highlighting the unique experiences that come with luxury travel. Fred’s attention to service remains a central theme, even in the wild. On U&Alibi at 8pm, My Life Is Murder presents a gripping murder mystery involving a toy inventor killed by a gargoyle thrown from a balcony. The episode adds a dark twist when the victim is found during a bathroom break, raising questions about the killer’s motives. The series follows detective Alexa as she uncovers the truth behind the crime, offering both suspense and humor in equal measure. The BBC Two show University Challenge returns at 8.30pm, featuring a battle of wits between student teams from Birmingham and Leicester. Hosted by Amol Rajan, the program showcases a mix of intellectual prowess and quirky moments, including a misheard novel title and a classics question that has become easier to answer in recent years. Finally, 999: What Happened Next begins its new series on Channel 4 at 9pm, following the aftermath of emergency calls. This week’s episode explores a chilling case involving a train passenger who notices something disturbing on a fellow traveler’s phone. The investigation that follows reveals a complex web of child exploitation, showing the far-reaching consequences of a single 999 call.