Snapped: Killer Couples (2013)

S2E8 Don't Even Blink

Frustrated by her brother's inventions constantly going missing, Candace rallies the whole neighborhood to construct a large, conspicuous contraption. She hopes this will allow them to finally uncover the mystery behind the vanishing gadgets. Meanwhile, in a separate storyline, Dr. Doofenshmirtz is busy perfecting his latest creation: an Invisibility Ray.