He made his television debut in the 2008 television drama series Rock Rivals as one of the contestants, Luke Ellis. He replaced a previous unnamed actor at the filming stages. Unlike co-star Holly Quin-Ankrah, Heras did not provide his character's singing voice. For the singing sequences Heras's voice was dubbed by that of Swedish session singer Emil Heiling. Heras however, was still given vocal coaching and was taught how to lip-sync. Following his role in Rock Rivals Heras was cast in the feature horror film Splintered as a "stoner" and "chilled out character who doesn't really care". He also appeared in two episodes of the third series of Hollyoaks Later, a late night spin-off from the Channel 4 soap opera as Dean Stanley. In 2010 he played Zavi in the fifth episode of BBC Three situational comedy The Gemma Factor.