Derek, desperately in need of a new power supply for the disintegrator, climbs a telephone pole (!) in order to cut the wires. Betty gets ahold of the “city electrical generating plant” (oh brother). She convinces the man on duty to…I don't know…he pulls a switch or something which is shuts off the power so that Derek can connect the disintegrator to the power lines. (Hey, that was a telephone pole, not a power line pole…oh well…let's just get this over with).

The other guy is right , it is Teenagers from outer space.