4321 was a film in 2010, created by Noel Clarke.
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- Ashley Thomas played Smoothy in 4321 and Sully's estranged cousin Jermaine Newton in Top Boy.
- Arnold Oceng played Dark Chocolate in 4321 and Femi in the pilot episode in Top Boy.
- Jo Martin played a driving examiner in 4321 and Zoe in Top Boy.