Peter Cullen, Frank Walker Talk Transformers

As part of the upcoming Blu-ray release of Transformers: The Last Knight (on 9/26), Peter Cullen (Optimus Prime) and Frank Welker (Megatron) spoke with Collider about the characters that they have been voicing for touch over 30 years now. Click here to read the entire interview, a few highlights below.

Highlights:
- The pair first worked together in 1979 for Mighty Man and Yuff

- Welker on design change of Megatron from cartoon to movie: "But it is interesting to see the changes from the animated version, the G1 version, which was pretty basic, to now with all of the technology and incredible things that they’re doing with design and color and sound … it’s a really interesting—excuse the pun—but true transformation. I’ve enjoyed watching it. I’ve actually had to change my voice to match the size and the differences in the characters."

- Welker enjoyed the ad libbing that Michael Bay encouraged when voicing Megatron for the movie.

- Difference in filming between cartoon and movies is cartoons often had all the voice actors in a room that allowed them to "kind of play off each other. You can build...almost like a play" while the movies required them to work "...one-on-one with Michael Bay, the sound engineer, and a camera on your lips"

- Welker at one point threw his jaw out for 15 seconds doing wolf fight noises while Cullen remembers coughing up blood due to roars for 1986's King Kong.