From the seemingly insurmountable problems of getting each stage of the Saturn V to work, to the challenges of making the Command Module safe following the fire that killed the first Apollo astronauts, even the engineers would have told you at times that they didn't think it could be done.
In 1987, hankering for more serious roles, he joined Kenneth Branagh's Renaissance Theatre Company where he took on a number of stage roles and appeared in Branagh's films of Henry V and Mary Shelley's Frankenstein.