The Umbrella Academy Quiz

Every performer credited in the series' own opening billing across its four seasons, sixteen in all, each confirmed against a second independent source. The answer is always the performer, not the role. A surname on its own counts. Two further performers appear in the series' own billing but could not be confirmed against a second independent source, so they are not answers here. Recurring and guest performers are not answers, however well known they are. Nothing here gives away how the story goes.