The 2010 Formula 2 champion was due to race in FR3.5 with ISR the year after his title triumph, before his career was interrupted by testicular cancer.
Having returned to racing in first powerboats, then the Porsche Carrera Cup in Britain, Stoneman made his single-seater comeback for the GP3 finale in Abu Dhabi earlier this month and came close to winning race two.
The 2015 Formula Renault 3.5 season will be notable for being the last with the French company's backing but also produced a worthy champion in Oliver Rowland. PETER MILLS evaluates this year's crop of drivers
Last year's field was extraordinary and hard to match, but the Formula Renault 3.5 grid will still have plenty of talent this season. Glenn Freeman runs through the field ahead of this weekend's season opener
Landing the Fortec seat that took rising star Robin Frijns to the 2012 FR3.5 title was already a good sign for Stoffel Vandoorne. Then McLaren took him under its wing. Peter Mills tells Vandoorne's story so far