S1·E18 Hang in There, Kay!

Kay and his friends battle against Duke. Even after Alf ties Duke up, Duck shoots his water guns at him and Selly uses the G-force Nanobombs to help Kay fight Duke, all their efforts are useless against the powerful enemy. But when Kay and his friends refuse to give up, Duke starts up his engine to suck in all the energy from the Fountain Plaza and causes a blackout.