Raquel Laguna/ SUCOPRESS. Keegan-Michael Key is the voice of B-127 in the animated movie Transformers One. In this interview, the actor talks about collaborating with director Josh Cooley again, after working with him on Toy Story 4. Keegan-Michael Key also talks about stepping into the role of B-127, especially in an origin story that explores a deeper side of the Transformers universe. Transformers One transports audiences back to where the saga started, the mysterious planet Cybertron, to reveal the beginning of icons Optimus Prime and Megatron in a spectacular animated origin story to the box-office-busting action-adventure series. Transformers One, the first-ever fully CG-animated Transformers movie, features a star-studded voice cast, including Chris Hemsworth, Brian Tyree Henry, Scarlett Johansson, Keegan-Michael Key, Steve Buscemi, Laurence Fishburne, and Jon Hamm.