Marvel weekend: Prepare for Infinity WarThe entire 10-year run of the Marvel Cinematic Universe is leading up to this: Infinity War. Nearly every character from every Marvel movie makes an appearances in Avengers: Infinity War, in theaters this weekend. Keep the nerd momentum going by catching some of the hits the MCU has put out over the years. All movies air on FX.Marvel's The Avengers: Iron Man, Captain America, Hulk, Thor and others have to overcome their differences to form the superhero group and save the world from Thor's scheming brother Loki. 5 p.m. Friday, 7 p.m. SundayThor: The god of thunder is exiled to Earth to learn the meaning of humility and what it means to be worthy of wielding the famed hammer. The origin film stars Chris Hemsworth as Thor and Natalie Portman as Jane. 8 p.m. FridayAmazing Spider-Man 2: Andrew Garfield is the web-slinger in this one, and fights new villain Electro. Peter Parker's best friend Harry Osborn is also named the CEO of Oscorp, which has connections to the mysterious disappearance of Parker's parents. Emma Stone is the iconic Gwen Stacy. 11:30 a.m. Saturday, 8 a.m. SundayThor: The Dark World: Brothers Thor and Loki have to work together to stop a Dark Elf who is bent on wiping out the entire universe. The sequel film lives up to its name of being bleak and, well, dark. 2:30 p.m. Saturday, 11 a.m. SundayIron Man 3: Set after the events of The Avengers, Iron Man (Robert Downey Jr.) is still pretty traumatized. Now he has to battle an enigmatic terrorist with the help of Col. James Rhodes. 5 p.m. Saturday, 1:30 p.m. SundayGuardians of the Galaxy: Also known as the movie where Marvel got funny, Guardians of the Galaxy groups together a bunch of cosmic criminals to save the galaxy. Included: A rocket-wielding raccoon and a talking regenerative tree. 8 p.m. Saturday, 4:30 p.m. SundayPrevious coverage: 'Avengers: Infinity War' is stunningly dark, but still wildly entertainingAmerican Visionaries: James Cameron's Story of Science FictionScience fiction is the cornerstone of popular culture, and the new AMC series American Visionaries: James Cameron's Story of Science Fiction aims to show an insider's look at the origins of the genre. The Academy Award-winning writer, director and producer James Cameron (Titanic, Avatar) sits down with stars and other A-list storytellers to explore sci-fi roots. The list for the six-part series includes Steven Spielberg, George Lucas, Guillermo del Toro, Ridley Scott, Christopher Nolan, Arnold Schwarzenegger, Will Smith and Sigourney Weaver. The series — part of the AMC Visionaries group — aims to explore where our ideas about science fiction came from and where they're taking us next. The premiere takes on "Alien Life," exploring what aliens can teach us about ourselves and highlighting franchises like Alien, Arrival and Avatar. 10 p.m. Monday, AMCMore TV: 'The Handmaid's Tale' returns with a brutal message about extremism and complacency Karate Kid spinoff: Cobra KaiThis new series isn't exactly television, but hear me out. YouTube Red's series Cobra Kai brings back the iconic characters of Karate Kid 34 years after the original. The rivalry between Daniel LaRusso (Ralph Macchio) and Johnny Lawrence (William Zabka) remains after Daniel won a karate tournament by delivering a swift kick to Johnny's face. Macchio and Zabka reprise their roles for the new series. Daniel is thriving as an owner of a car dealership, but Johnny seems to be struggling — until he sees a teen being bullied. The trailer shows Johnny moving to reopen the dojo Cobra Kai, but Daniel isn't exactly on board. It ends with Daniel gearing up for a fight and telling Johnny they aren't done. Inevitably, their lives become intertwined as they work and fight to prepare the next generation of karate kids. Midnight Wednesday, YouTube RedHolmes and Watson return: ElementaryThe modern spinoff drama of the classic story of Sherlock Holmes and Dr. Watson returns for a sixth season on Monday. Elementary stars Jonny Lee Miller as Detective Holmes of the NYPD and Lucy Liu as Dr. Joan Watson. As a team they're tasked with solving the city's seemingly unsolvable cases, including delving into the city's underworld and tackling unsolved murder cases. Last season's finale ended messy, with Sherlock and Watson's friendship on the rocks. Teasers to the new season indicate their relationship will continue to be tense. In the premiere, while Holmes has to confront a shocking medical diagnosis, he and Watson are hired to track down an heiress's missing partners from a years-old sex tape. Check it out 10 p.m. Monday, CBSUPCOMING STREAMING RELEASESFriday: Bobby Kennedy for President (Netflix), Tiny Shoulders: Rethinking Barbie (Hulu)Monday: The Carmichael Show Season 3 (Hulu)May 1: Jewel's Catch One (Netflix), A Nightmare on Elm Street (Hulu), Rocky (Hulu)May 11: Claws Season 1 (Hulu)May 12: Orphan Black Season 5 (Amazon)Contact Chelsea Tatham at [email protected] Follow @chelseatatham.