Professor X appears in more than one flashback in X 83, but one of them is actually a flashback within a flashback.
PROFESSOR X/CHARLES FRANCIS XAVIER
…
UX 350
*X 83-FB-FB
X 73-BTS
UX 362
UX 363
X 83-FB
X 83
…
Moderators: Col_Fury, michel, Arthur, Somebody, StrayLamb