He appeared in a single episode of The Venture Bros., this character (referred to as "OSI Instructor" in the voice credits) Treister's son is also the person who administered Brock Samson's test to renew his OSI Agent license (and license to kill.). Despite Samson's refusal to engage in many of the tasks given by the tests (or at least, in the way the test asked for), Treister's son allowed him to pass.