“Jonas” (9 p.m., Disney Channel): On “Jonas,” the guys learn that an old

“Jonas” (9 p.m., Disney Channel): On “Jonas,” the guys learn that an old friend wants to use their fame to his own advantage.

“Lake Placid 2” (9 p.m., Sci-Fi Channel): Cloris Leachman and a giant man-eating crocodile. This one has it all.