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

This week: After the first post-bankruptcy talc trial ended in a mistrial last month, a second started on Monday against Johnson & Johnson. A federal judge granted final approval to 3M’s water contamination settlement of up to $12.5 billion. Find out who is representing video game developers such as Epic Games and Roblox in addiction lawsuits.