Christopher Eccleston broke down on Good Morning Britain as he revealed he was bullied as a child.
The actor became very emotional when recalling his bullying ordeal when he was at school.
Eccleston appeared on Good Morning Britain to campaign against playground bullying.
He confessed that, while he had been a victim, he was 'ashamed' to have been a bully himself.
The 52-year-old said that being bullied aged five 'really coloured my life'.
'Play time became terror time,' he told hosts Piers Morgan and Susanna Reid.
'I didn't want to go to school. But this was 1969 on a council estate in Manchester and as I've grown up and thought about that girl, she seemed not as cared for, physically, as some of the other children.
'My thought is "God knows what was going on at home" because there was a sense that this girl was very troubled.
'I was bullied there, and then when I moved up to the Juniors, I was bullied again by a boy.
One of the factors is shame and I could never tell my parents because I grew up in a macho culture.'
The actor became emotional recalling his experiences with bullying as a child (Picture: Ken McKay/ITV/REX/Shutterstock)
But it wasn't just the bullying that changed him as Christopher became tearful as he recalled the boy he tormented in school.
'I'm very, very ashamed of it,' he said 'I know his name, I don't know where he is. He was a very sensitive boy.'
When asked if he would like to apologise to the child, Christopher said: 'Of course! Of course!'