Best Bets on TV Tonight

From Harrisburg, Pa., "Eukanuba Tournament of Champions" (8 p.m., Animal Planet) showcases dozens of breeds of dogs compete for the best-in-show title and an invitation to the nationals in January, to be held in St. Petersburg, Fla.
As his 18th birthday approaches, college-bound Daniel begins to notice that his neighbors are behaving strangely. What he doesn't know is that his mother is a member of an alien colony that has come to infiltrate his small close-knit suburban community in "They Are Among Us" (9 p.m., SciFi). Corbin Bernsen, Alison Eastwood, Bruce Boxleitner and Nana Visitor star.
There have been so many funny flubs during its 50 years in television, ABC needed a Part 2 of its latest blooper special for the "50th Anniversary Blooper Celebration" (10 p.m., NBC). Dick Clark hosts; guests include Dennis Franz of "NYPD Blue" and Tom Bosley of "Happy Days."
Is your life lacking a little magic? "Ends of the Earth" (10 p.m., Travel Channel) comes to the rescue with globe-trotting magician Franz Harary and his big-ticket illusions. In Hawaii, he moves Diamond Head. In India, he makes the Taj Mahal vanish. For the big finale, a Thai princess is turned into a python.
A new documentary, "P.O.V.: Thirst" (11 p.m., PBS) zeroes in on the way water is used, stored and valued. The program explores how pollution and population growth are turning the planet's dwindling water supply into "blue gold," or the oil of the 21st century.