File:X-Men Vol 1 21 001.jpg

Description
Flying towards Lucifer's hidden base, the X-Men witness a strange beam of light emanating from the sky and transporting objects into a mountain. Defensive mechanisms prevent them from investigating the mountain, but once they see a suspicious river flowing into the mountain, they know how to get in. While Xavier stays behind at the plane, the X-Men make their way on the river on an iceraft, but a whirlpool sucks them down to an underground cave. Not before long the X-Men get captured by robots and are imprisoned inside a glass cube. Having lost contact with the team, the professor tries to focus his powers and fails to notice two robots sneaking up on him. He is captured and brought to Lucifer, who explains him the indestructible Dominus device, a machine build by his alien race and is capable of enslaving entire worlds. The X-Men manage to escape when the robots try to move the cube to a different location. They set out to find Lucifer and destroy Dominus, but Xavier telepathically warns them not to hurt the machine. However they don’t understand at first and suspect the message came from Lucifer. Angel and Iceman even try to destroy the machine, but Scott and Jean intervene. When the robots appear to attack them they quickly learn why they shouldn't hurt the machine. Dominus can resist any form of attack and back fires it towards the attacker. The X-Men use this against the robots and outsmart them into firing their beams on the device. All remaining robots end up destroyed. The Supreme One, the leader of the aliens, angrily contacts Lucifer and since the machine is useless with the robots to operate it, the Dominus device is transported back to their planet, while Lucifer is disintegrated.