reports that the 3rd Season of “Riverdale” is bringing a lot of changes. Recently Shannon Purser, the actress who plays Ethel Muggs, teased fans. “There’s definitely more Ethel in Season 3, so fans can definitely look forward to that and it’s definitely interesting. I can’t give away too much, but she definitely undergoes some pretty big changes…” Shannon Purser, Actress For diehard “Riverdale” fans this is an interesting notion.