Watch X-Men Season HD Full Free on solarmovie.do. Watch X-Men tv series online free. X-Men, still grieving over the death of Phoenix (Jean Grey), are investigating a case of a missing m...X-Men, still grieving over the death of Phoenix (Jean Grey), are investigating a case of a missing mutant girl in Northern Japan. This leads them to a mysterious virus that turns mutants into monsters. U-Men and the Inner Circle want it.