Real name Margaret Marsh. The nickname probably comes from her heroin habit. She is an ex-University student who was framed for murder, and ends up in Blackmoor, where she is first seen when Rita is transferred there (665). After the riot she is transferred to Wentworth, where Marty Jackson recognises her and is determined to try to clear her name. This very nearly costs him his career, when Kath Maxwell is paid by Ron Willis to drug Spike and frame Marty for supplying her. Before the end of the series, Spike is persuaded to clean up and go back to live with her family (691).