Monster Weather

Monster Weather is the thirty-sixth episode of Ben 10. This episode celebrates the two-year anniversary of Ben 10.

Plot
Grandpa Max takes Ben and Gwen to a music festival in Chicago to see his favorite old-time band, Shag Carpeting, but the event's interrupted by a weather-controlling robot called S.A.M. (short for Sounding Annometer Metograph). Vance Vetteroy, a weatherman who created S.A.M., reprograms S.A.M. to create weather rather than report it, but S.A.M. gets struck by lightning and then takes on a mind of its own. S.A.M (the cloud monster) first uses water, then lightning and finally a tornado to fight his creator, and then Ben, Gwen and Grandpa Max during the Shag Carpeting concert. Ben (as Four Arms) strums on an amplified guitar to create an opposite feedback frequency to finally destroy S.A.M..

Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Grandpa Max
 * Vance Vetteroy (first appearance)
 * Steve (first appearance)
 * Brad (cameo)
 * Shag Carpeting (first appearance)
 * Captain Shaw (cameo)

Villains

 * S.A.M.

Aliens Used

 * Heatblast (accidental transformation; selected alien was Ripjaws)
 * XLR8
 * Four Arms

Allusions

 * The water monster that appears looks somewhat like Perfect Chaos from the video game Sonic Adventure.

Trivia

 * Captain Shaw can be seen fishing in this episode.
 * The trio's thirty-fifth stop is Chicago.
 * Ben displayed guitar playing and snow boarding ability in this episode.
 * Ben mentions Aunt Vera, who the Tennysons visited in Permanent Retirement.
 * A running gag in this episode is Ben talking about having a bath or not.
 * The water park attendant Brad from A Small Problem can be seen in the audience during Shag Carpeting's concert.
 * S.A.M. has two plasma balls connected to his arms (in his true/robotic form).