Rob Riggle Kicks Off Shark Week with Shark Trip: Eat. Prey. Chum.

Discovery Channel's annual Shark Week kicks off tonight with the return of Rob Riggle (who co-starred last year with Shaquille O'Neil in Shaq Does Shark Week).  This year, Riggle will be doing double duty, closing out each night's primetime programming with the late-night show Shark After Dark, and starring in tonight's kick-off special, Shark Trip: Eat. Prey. Chum.

SPECIAL PRESENTATION:  Rob Riggle invites some of his celebrity pals for a fun guys trip on the open seas in Shark Trip: Eat. Prey. Chum. What Anthony Anderson, Joel McHale, Adam DeVine, and Damon Wayans Jr. don't know until after they set sail is that Riggle intends to take them swimming with sharks.  9:00 PM ET on Discovery

SERIES PREMIERE: Just when you thought the Batman story had been told from every possible angle comes Pennyworth, focusing on Bruce Wayne's longstanding and loyal butler, Alfred Pennyworth. Relative newcomer Jack Bannon (The Imitation Game) plays Alfred, a former special forces soldier in Britain living in swinging '60s London. 9:00 PM ET on EPIX

NEW EPISODE: The penultimate episode of fast-as-hell teens in peril on Euphoria is called "The Trials and Tribulations of Trying to Pee While Depressed." Which honestly leaves so many avenues open for teens to get in trouble. Series creator Sam Levinson is back to write and direct both this episode and the season finale. 10:00 PM ET on HBO

NEW EPISODE: The Roger Ailes story rolls on in The Loudest Voice, this time stopping in 2012, where Ailes (Russell Crowe) is really exercising his power as the string-puller of the right wing. But after years of harassment, Gretchen Carlson (Naomi Watts) is poised to take him down. 10:00 PM ET on Showtime

ALSO TONIGHT:

• Sweet Bitter promises to make you cringe when Tess has a mortifying sexual encounter with Omar. Also: Sasha receives terrible news from home, and a table makes a racist comment to Heather. 9:00 PM ET on Starz
• Expedition Unknown: Megalodon will see Josh Gates dive into shark-infested waters to try to unravel one of the ocean's greatest mysteries -- the phenomenon of the ancient, extinct, giant shark known as the Megalodon. 8:00 PM ET on Discovery
• Shark After Dark returns for another week of late night Shark talk, this year with Rob Riggle hosting. Celebrity guests and shark experts will join Riggle each night to unpack the evening's shark programming. 11:00 PM ET on Discovery

Joe Reid is the senior writer at Primetimer and co-host of the This Had Oscar Buzz podcast. His work has appeared in Decider, NPR, HuffPost, The Atlantic, Slate, Polygon, Vanity Fair, Vulture, The A.V. Club and more.