Strikes by Hollywood actors appear to be affecting major films in production, including the Avatar and Gladiator sequels.
Promotional events such as red-carpet premieres, such as the upcoming Disney feature Haunted Mansion, would also be impacted.
Events such as the Emmys and Comic-Con may be rescheduled or reduced in size.
In the industry’s largest shutdown in over 60 years, about 160,000 performers ceased working at midnight in Los Angeles.
Picketing will begin outside Netflix’s California offices on Friday morning, before going on to Paramount, Warner Bros., and Disney.
The strike notice followed a similar strike by the Writers Guild of America (WGA), which halted most US film and television operations.
The Screen Actors Guild (SAG) wants streaming companies to agree to a more equitable profit split and improved working conditions.
It also wants to protect actors from being usurped by digital replicas.
The union is seeking guarantees that artificial intelligence (AI) and computer-generated faces and voices will not be used to replace actors.
While the strike lasts, actors cannot appear in films or even promote movies that they have already made.
Other productions which may be affected include Deadpool 3, starring Ryan Reynolds and Hugh Jackman, along with Tim Burton’s Beetlejuice sequel and a film adaptation of the musical Wicked.