According to Wally Burr, Veteran radio host Keener was slated to play Scorponok's car drone Fasttrack, before The Rebirth got trimmed to three parts. Even though he only managed to play Blowpipe in the series, he did play various characters in various Transformers commercials from 1985 all the way through 1990 (His deep voice can be heard as both Sixshot and Cyclonus in the Sixshot commercial).
Stephen Keener is mistakenly attributed Ed Flanders' characters. This is due to the fact that Keener played a lot of Flanders' characters in the commercials. The only way to tell them apart is by their voices. Keener has a natural deep voice while Flanders' deep voices tend to be somewhat inconsistent (sometimes raising to a high pitch when his characters are screaming).