Mr. Hollis appeared in the Season Thirteen episode, "Pinewood Derby". He and Randy Marsh are long time rivals in the Colorado Championship Pinewood Derby contest.
Mr. Hollis takes Pinewood Derby racing very seriously. When Randy and Stan's race car wins by blasting off into outer space, Mr. Hollis commits suicide in shame. His son, Emmett Hollis witnesses this traumatic event and is put into a state of shock.
In an outtake on the Season Thirteen DVD, Randy calls Hollis on a mobile phone to taunt him, bragging about how fast their car has gone. Mr. Hollis is shown surrounded by many trophies in his study and is confident that he will win in the upcoming race.