Behind the catchy tunes and slick choreography, there's a fine-tuned formula for creating hits and harnessing the power of fans.

Bradley Walsh hosts the comedy quiz show in which a panel of six celebrities fill in the missing blanks and help win some brilliant prizes for some very lucky contestants. This week, he is joined by Julian Clary, Sophie Willan, Harry Pinero, Liza Tarbuck, Judi Love and Tom Allen.

Ant and Dec host the third live semi-final as more acts that made it through the auditions perform in front of the judges and a live audience for a chance at a place in the final. Viewers hold the power to vote for their favourite acts of the night to send through to the ultimate stage of the competition, and one judge has the Golden Buzzer that can reward one outstanding performer with a ticket straight through.

Test cook Nik Sharma makes host Julia Collin Davison a flavorful Tandoori Salmon. Gear Heads hosts Hannah Crowley and Lisa McManus share their favorite kitchen gadgets under $15. Tasting expert Jack Bishop challenges Julia to a tasting of yogurt. And test cook Lan Lam prepares Broiled Smashed Zucchini with Garlicky Yogurt for host Bridget Lancaster.

Hilltribe chicken with kua txob; difference between fondue and fonduta; tomatoes with fontina sauce.

Gabby Logan presents highlights from the day's five Premier League games, including Manchester City against Brentford and Liverpool versus Chelsea. Elsewhere, Sunderland host Manchester United at the Stadium of Light, Fulham face Bournemouth at Craven Cottage, and Brighton take on Wolves.

World Heavyweight Championship Match 
Roman Reigns (c) vs. Jacob Fatu.

Seth Rollins vs. Bron Breakker.

United States Championship Match
Trick Williams (c) vs. Sami Zayn.

Danhausen & a mystery partner vs. The Miz & Kit Wilson 

IYO SKY vs. Asuka.

No breakthroughs to end the war with Iran have been made as the U.S. awaits Iran's response to its latest peace proposal. Despite exchanging fire this week, both sides are maintaining that the month-long ceasefire still holds. NBC News' Julie Tsikrin has the latest. A Frontier Airlines plane aborted take off after it hit and killed a trespasser who gained access to the runway. Video from inside the plane shows panicked passengers as smoke filled the cabin. Emergency responders reported that there appeared to be "human remains on the runway." It is unclear how the individual made it on the tarmac. NBC News' Liz Kreutz has the latest. A Texas man accused of murdering his pregnant wife will appear in an Italian courtroom as a judge decides whether to extradite him back to the U.S. According to a federal complaint, the man cut off his ankle monitor and fled to Canada before traveling to Italy. NBC News' Molly Hunter reports. At least 11 people were hospitalized Saturday following a possible boat explosion near North Miami Beach. NBC News' Kathy Park reports. The head of the World Health Organization on Saturday made an appeal to locals in Tenerife to remain calm as the Spanish island prepared to receive passengers from a hantavirus-hit cruise ship that left three people dead. NBC News' Daniele Hamamdjian reports. In an NBC News investigation, our team spoke with contractors and a homeowner who allege the Army Corps of Engineers did not properly clean up debris after devastating California wildfires. Now, they're worried about potential toxins that could be lingering in the soil. NBC News' Steve Patterson reports. As prom season begins at schools across the country, St. Jude Children's Research Hospital held its own teen formal for patients in its care. NBC News' José Díaz-Balart has that story and more prom-related moments in this week's Good News Wrap-Up. 

In this episode, teams must join forces to score big and stomp out the competition. Mary receives the unlikely help from Dave with the lively sounds of a Mariachi band. Meanwhile, Rene and Ivy locker-block Darrell in a fierce showdown.

Svengoolie presents us with a movie that reveals that Men actually landed on the moon in the 1800's. Featuring special effects by the famous Ray Harryhausen. Svengoolie presents us with offbeat humor and movie and actor trivia.

Kara travels to South Korea to explore a health care system that combines preventative, accessible care with cutting-edge health technology, and asks what Koreans can teach Americans about living longer, healthier lives.

Dave is joined by his biggest fan, who helps him sink a winning locker. Emily is determined to "selvage" a profit from a smaller unit. Lisa puts her faith in Karma and it treats her like royalty. Kenny carves out some monies in record time.

When a beloved North Philadelphia school teacher is ambushed in a Dunkin' Donuts drive-thru, detectives uncover a deadly plot involving jealousy, deceit, and revenge.

When Beverly Hills police respond to a 911 call at a mansion, they discover a widow, Violet Yacobi, dead below a staircase. How did she end up on the marble floor of her entryway, and was her death the result of a tragic accident or something more sinister? As detectives dig deeper, conflicting accounts and forensic evidence raise suspicion about Violet's dentist son Daniel Yacobi.

Willie is on a mission in Texas- part wild outdoor adventure, part secret scouting trip to size up Christian and Jacob for Duck and Buck Commander jobs.

Matt Damon will host "SNL" for the third time on May 9. The Academy Award winner next stars in Christopher Nolan's "The Odyssey," in theaters July 17.

Noah Kahan will perform as musical guest for the second time. The Grammy nominated, multi-platinum artist's highly anticipated fourth album, "The Great Divide," will be released April 24.

Ernie Johnson, Charles Barkley, Kenny Smith and Shaquille O'Neal discuss and give analysis of tonight's games, including highlights and interviews.  

Demons and Devils lie in wait to attack Keiji and his flock.

Sarah Adams is given a drugged drink by a taxi driver and is certain she was raped. After months of Sara feeling disbelieved by the police, her case is dropped and the man is free to attack again.

Student Laila Mahmood is drugged and assaulted by John Worboys, but her claims are dismissed by police and her case is dropped, despite the evidence of CCTV footage. Eventually, police spot a disturbing pattern.

In 2008, it becomes clear that a cab-driving serial rapist is operating in London. An appeal leads a nurse who treated Laila to contact the police, which results in Worboys' arrest. Dozens of other potential victims come forward, including Carrie, who realises that he must have drugged her too. Sarah and Laila approach renowned solicitor Harriet Wistrich and decide to sue the Metropolitan Police.

With the help of Phillippa Kaufmann, Sarah and Laila receive documents from their original cases. After discovering that leads were botched and internal investigations have exonerated officers, they sue the Met police under the Human Rights Act. When it is announced that John Worboys, now seemingly God-fearing and penitent, is to be released on parole, Carrie spearheads a publicity campaign to force a judicial review,