S4 E13 - Goodbye and Good Riddance
S4 E12 - Ben 10 vs. Negative 10 (2)
S4 E11 - Ben 10 vs. Negative 10 (1)
When 10-year-old Ben Tennyson discovers a mysterious device, he gains the power to change into ten different alien heroes, each with uniquely awesome powers. With such abilities at his disposal, Ben realizes a greater responsibility to help others and stop evildoers, but that doesn't mean he's above a little superpowered mischief now and then.
Ben 10 - watch online: streaming, buy or rent
Currently you are able to watch "Ben 10" streaming on HBO Go.