Ben 10: Battle Ready

In Ben 10: Battle Ready, Ben is sent to a deserted Sumo Slammer Card factory by Gwen and Grandpa Max to hone his new skills with the Omnitrix, but his training is put to the test when Vilgax discovers the Omnitrix's power signal and dispatches his robotic minions to steal the device, forcing Ben to become a hero and defend it at all costs.