Tracker has already made multiple cast changes - and is planning to bring in even more new characters - but has the shake-up been successful? During an exclusive interview with Us Weekly, executive producer Elwood Reid addresses Mel's (Cassady McClincy Zhang) introduction to the show through Reenie (Fiona Rene). "It's interesting because I do think for the show to work, Renee in that world of the office has to stand on its own," he explained. "Or be able to tell stories on its own. Back in the day, when we only had Reenie just sitting around waiting for Colter to call, that didn't work.