Cartoon Brew is reporting that Robert Downey Jr. has been tapped to play the voice of none other than Mr. Peabody in a new live action/CGI film from Dreamworks, Mr. Peabody and Sherman. For you young folks who don’t know: Mr. Peabody is a genius-level talking dog, and Sherman is his loyal human boy assistant. The original animated cartoon was part of the Rocky & Bullwinkle cartoon series, animated by Jay Ward Productions. This new version is being written by Jeffrey Ventimilia and Joshua Sternin (from the recent Yogi Bear movie) and directed by Rob Minkoff (from The Lion King). There’s a wait to see how this turns out: The film isn’t due until 2014.