In the final episode of Netflix's I Will Find You, Theo is revealed to be Matthew Burroughs, the missing child at the centre of the series, and the show leaves little room for doubt about the paternity twist. Theo is the biological son of David Burroughs, the wrongly imprisoned father played by Sam Worthington, not Hayden Payne, whose obsession drives the ending into chaos.
The series begins with David in prison for the murder of Matthew, who was believed to have died in his own bed at the age of three. That certainty starts to crumble when journalist Rachel Mills, played by Britt Lower and also the sister of David's ex-wife Cheryl, visits him with a photograph taken at Six Flags. In the background is a boy who looks exactly like Matthew, complete with the same birthmark on his cheek.