Former N-Dubz singer Dappy has denied assaulting a man outside a nightclub in Essex.
Dappy, whose real name is Costadinos Contostavlos, is accused of attacking the man on February 27 at Chicago's nightclub in Chelmsford, Essex.
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Peter Barnett made hundreds of trips from his home in Oxfordshire to Marylebone station without paying the full fare.
Police say he may have attacked more children and urged them to come forward.
The suspect walked up to a Tesco employee and shoulder barged him to the ground before punching him repeatedly in the face.