(in credits order)
- Thomas Crosse(as Thomas 'Crossy' Crosse)
- Michael D. Higgins(as President Michael D. Higgins)
- Andrew Burke(as Professor Andrew Burke)
- Seán McDermott(as Sean McDermott)
- Michael W.J. Smurfit(as Dr. Michael Smurfit)
Rest of cast listed alphabetically
- Mohamed Farah(archive footage)
- Mel Gibson(archive footage)
- Arthur Guinness(archive footage)
- Paul Hogan(archive footage)
- Sarsfield Hogan(archive footage)
- Grace Kelly(archive footage)
- Hugh Lane(archive footage)
- Anthony O'Reilly(archive footage)
- Liam Cunningham(uncredited)
