September Episodes w Descriptions

Monday, September 14
Original Series - Episode Premiere
Star vs. The Forces of Evil "Interdimensional Field Trip / Marco Grows a Beard"
(8:30 PM - 9:00 PM ET/PT)

"Interdimensional Field Trip" - Star leads a class field trip to a museum in another dimension and puts the entire class in danger.

"Marco Grows a Beard" - When Star flubs the spell used to help Marco grow a beard, the beard grows out of control and engulf the house.
Michael C. Hall ("Dexter") recurs as Toffee.

Monday, September 21
Special Half-Hour Episode
Star vs. The Forces of Evil "Storm the Castle"
(8:30 PM - 9:00 PM ET/PT)
When Marco is captured by Toffee and held for wand-ransom, Star enters into an unlikely alliance with Ludo and Buff Frog.
*Michael C. Hall ("Dexter") recurs as Toffee.

Source: http://www.broadwayworld.com/bwwtv/article/Disney-XD-Announces-September-2015-Programming-Highlights-20150828#