Collected editions of the 114-issue ongoing series written by Peter David, quite possibly the most unpredictable book in the Marvel line-up. A psychological tour de force that doesn't skimp on the laughs, action or mystery, each issue of X-Factor brings something new to the table. Maybe not the best bet for a young reader, but a killer title for serious readers.
After issue #50, Marvel started counting all the issues of X-Factor together, jumping to issue #200.
#001-149 X-Factor (1986)
#000-000 X-Factor (2002)
#150-262 X-Factor (2005)
#263-282 All-New X-Factor (2014)
#283-288 X-Factor (2020)