Weekend TV watch

“20/20” (tonight at 10 on ABC) investigates the case of Michelle Carter, the Taunton teenager convicted of encouraging her online boyfriend to commit suicide. The hour includes police recordings of conversations with Carter as well as interviews with those who knew Carter and the victim. Carter was sentenced yesterday to two-and-a-half years in prison.

Dorothy, that little girl from Kansas, is once again

“Lost in Oz” (series streaming premiere today on Amazon). The animated take on the classic tale is geared to kids 6-11 and finds the Emerald City suffering a drought of magic. It features the voices of Gina Gershon and Allison Mack (“Smallville”). Selena Gomez hosts “WE

Day” (tonight at 8 on CBS), spotlighting those individuals who are changing the world for the better. Oprah, James Franco, Alicia Keys and Miss Piggy are among the celebrities popping up.

Everybody’s favorite fixer is back. “Ray Donovan” (Sunday at 9 p.m. on Showtime) finds Ray taking on a new client — Oscar winner and recent Emmy nominee (“Feud”) Susan Sarandon — as a media mogul turning Ray on her own fixers because they know too much. Sarandon will be sticking around for the season.

You’re going to watch this no matter what anyone says: “Sharknado 5: Global Swarming” (Sunday at 8 p.m. on Syfy) finds Ian Ziering and Tara Reid once again fighting the worst kind of weather — tornados that bring downpours of ravenous sharks. With Charo as the queen of England. Now that’s just typecasting.