In 1928 Thelma was chosen to star in a series of short films based on the comic strip Toots and Casper by Jimmy Murphy. She played Toots, a ditzy but lovable wife and mother. Bud Duncan was cast as her husband Casper. Thelma and Bud would make twelve Toots and Casper shorts including Big Hearted Toots, The Family Meal Ticket, and Casper's Night Out. Several of the films were directed by Thelma's fiance St. Elmo Boyce. The final short in the series was Don't Say Ain't released in 1929. Thelma had to wear a blonde wig in all of the films. Unfortunately most of the Toots and Casper movies are considered lost. As of 2017 only Fooling Casper, Smile Buttercup Smile, and Casper's Week End are available to watch.
Scenes from Fooling Casper
Scenes from Smile Buttercup Smile
Scenes from Casper's Week End