America's Got Talent Marks Fifteen Years With a Star-Studded Anniversary Special

Over the last fifteen years, America's Got Talent has welcomed countless musicians, dancers, magicians and, yes, ventriloquists to its stage. The show's producers told Primetimer's Mark Blankenship they had a blast putting together tonight's two-hour look back special, which includes a countdown of the show's most viral performances and a peek at the franchise's never-before-seen pilot episode. Also tonight: HBO dunks its cameras in the swamps of D.C., Jeff Foxworthy helps A&E look for treasure, and the boys from American Chopper take one last ride. Here's what's new and noteworthy on TV this Tuesday:

SPECIAL PRESENTATION: This season's live shows are set to start next week, but first the AGT marks a milestone with tonight's America's Got Talent 15th Anniversary Special. The two hour special is set to include star-making performances from AGT favorites like including Shin Lim, Grace Vaderwaal, Kodi Lee, V. Unbeatable, Zurcaroh, and more. Terry Crews hosts. 8:00 PM ET on NBC

NEW EPISODE: Six of the top twelve acts take to the stage for this season's World of Dance semi-finals as Jennifer Lopez, Derek Hough, NE-YO, and Scott Evans look on. 10:00 PM ET on NBC

DOCUMENTARY PREMIERE: HBO's original documentary The Swamp profiles three Republican Congressmen who've marched in lockstep with the President who promised to drain it. Watch the trailer. 9:00 PM ET on HBO

SERIES PREMIERE: It's been a particularly bumpy ride this year for A&E, between the pandemic and the recent cancellation of Live PD, the hugely popular but problematic franchise around which it had built its brand in recent years. As Aaron Barnhart writes today, it's grand opportunity for the nearly 40 year-old network to reinvent itself (again). Although Jeff Foxworthy doesn't strike us as the face of reinvention, he is the host of the network's first post-Live PD series. In What's It Worth, Foxworthy connects with Americans across the country to help them learn the value of the hidden treasures stashed in their attics and basements. Watch the trailer. 9:00 PM ET on A&E

SPECIAL PRESENTATION: Buckle your seat belts, American Chopper fans, it's reunion time. When they learn of plans to tear down the original Orange County Choppers building, Junior and his father return to their old shop for one final epic build on American Chopper: The Last Ride. Watch the trailer. 9:00 PM ET on Discovery

SERIES PREMIERE: Just in case Jeff Foxworthy fails to right the A&E ship, fear not, the ever industrious powers that be have another card up their sleeves with Extreme Unboxing, a new series in which some true characters purchase pallets of merchandise returned to internet retailers, in the hopes of finding gold in the heaps of second hand rubble. Watch the trailer. Two back-to-back episodes begin 10:00 PM ET on A&E

NEW EPISODE: The family is still growing on Counting On as Kendra and Joe welcome the arrival of their new baby girl. 8:00 PM ET on TLC

Mike Attebery is Senior Editor at Primetimer and the author of seven mystery thrillers. Follow him on Twitter at @mikeattebery.