Welcome to Law.com Class Actions: Critical Mass, a weekly briefing for class action and mass tort attorneys. 

This week: With billion-dollar settlements and bankruptcies, is the opioid litigation wrapping up? Not quite. Also, new lawsuits blame Kia and Hyundai for a raft of auto thefts sparked by viral videos on TikTok and YouTube. Who is representing Nelnet Servicing LLC in lawsuits over its Aug. 26 data breach?