Chris Hemsworth is in talks to star in an upcoming crossover movie that combines the 'Transformers' and 'G.I. Joe' franchises. The film, currently untitled, will be produced by Michael Bay and is based on the popular Hasbro toy lines. Steven Caple Jr. was previously in discussions to direct but has since exited the project. Hemsworth's involvement follows his recent voice work as Optimus Prime in 'Transformers One'. The project is being developed by Paramount Pictures in collaboration with Hasbro. The news was first reported by Deadline.