Season 3 is often considered the "sweet spot" of the series. Sheldon is old enough to be truly formidable in his arguments but young enough to still be under the watchful, protective eye of Mary Cooper. Episode 13 specifically highlights the transition from Sheldon being a "boy genius" to a legitimate (if difficult) academic peer.
You can also check if the episode is available for download on other platforms such as YouTube, Microsoft Store, or Facebook Watch. young sheldon s03e13 download