David Haller
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Bill Irwin from 'Legion' on portraying superheroes with complicated powers
The series depicts the adventures of Professor X’s son, David Haller (played by Dan Stevens of “Downton Abbey” fame), with the good Professor himself getting a mention in Season 1. Haller’s powers can be fairly easily explained — he’s a vastly powerful psychic who has to deal with having being diagnosed with schizophrenia at a young age.