Henry is a major character in "Teenage Mutant Ninja Turtles Attack!!!". He is a Temporal Dimensional Analyst in training, and was working on a Time Gauntlet that would allow not only time travel, but to also take things from other time periods, when the Random Dating Council sent Betti Clane to go on a blind date with him, much to his confusion and chagrin. However, once the gal took interest in his work, he proudly began to show her around, ultimately resulting in Betti accidentally sending the duo right in front of the Ninja Turtles in Florence, Massachusetts.
Every attempt Henry makes to re-calibrate his gauntlet to send him and Betti back only results in him pulling other entities from various time periods to Florence. After the Turtles beat back dinosaurs and robots and are faced with a horde of samurai, Donatello takes the gauntlet and fixing it himself, sending back the samurai and allowing Henry and Betti to return home.
It all works out for Henry, though, as Betti enjoyed their date.