My Babysitter's a Vampire: Ethan Morgan, his half-vampire babysitter and pals battle against creatures from their nightmares in the series premiere (8 p.m. Disney).
Whale Wars: In this new episode, the Brigitte Bardot's crew evacuates its damaged boat, and the Sea Shepherds openly engage a Japanese government vessel for the first time (9 p.m. Animal Planet).
Celebrity Vacation Homes: This new episode visits Barack Obama's Oahu vacation home (9 p.m. HGTV).
Chasing UFOs: In this new series team investigates reports of strange lights in the skies over two Texas towns (9 p.m. National Geographic). A second new episode investigates reports in central California at 10 p.m.
Louisiana Lockdown: In this new episode a new inmate who's just arrived to serve a life sentence, meets his grandfather, also a lifer, for the first time (10 p.m. Animal Planet).
Flying Wild Alaska: The Iditarod dog sled race begins and a search is launched for lost snow-machiners (10 p.m. Discovery).
Mariachi High — PBS Arts: PBS' Summer Arts Festival kicks off with this film that follows a year in the life of the champion mariachi ensemble at Zapata High School in South Texas (9 p.m. KOCE).
Track & Field Finals: (7 a.m. and 3 p.m. NBCSP). Men's Gymnastics :(9 a.m. NBCSP). Women's Gymnastics (9 p.m. NBC). Swimming: (11:30 a.m.; 1:30; 9;10:30 p.m. NBCSP); (8 p.m. NBC).
Baseball: The Houston Astros visit the Chicago Cubs (11:10 a.m. WGN A); the Angels visit the Toronto Blue Jays (4 p.m. FSN); the New York Mets visit the Dodgers (7 p.m. FS Prime).
Softball: World Cup: Australia vs. United States (4 p.m. ESPN).
NASCAR: Nationwide Series: Feed the Children 300 (4:30 p.m. ESPN2).
X Games: (6 p.m. ESPN).
Wimbledon Championships: Early round (Saturday 5 a.m. ESPN).