Walter Koenig joined the main cast of ' during the as Pavel Chekov and continued to appear in the series until it was cancelled at the end of . Although the remaining main cast of the series were hired as voice actors for ', Koenig was not brought in due to financial restraints. He only found out about his omission from the show when Sackett announced it on stage at a "Star Trek" convention he was attending. His character was replaced by a new animated character voiced by James Doohan.