Supergirl, who also referred to herself as "the Girl of Steel", was the host of Meet That Hero!.
Biography
Supergirl came to Earth in a pod, and was later taken in by a "caring Earth family", and was a "huge fan of disguises", despite later claiming that "a pair of glasses is all you really need". At some point, she became the host of Meet That Hero!.
In her capacity as its host, she told the story of E.T., pointing out several similarities between him and herself. As the program drew to a close, E.T. offered her a Kryptonian singing flower he had grown using his abilities. Overjoyed, Supergirl voiced her intention to create an "alien club". The Twelfth Doctor, also present at the shooting, was enthusiastic about the idea and offered the help of his TARDIS. (WC: Supergirl Meets E.T.)
Behind the scenes
Krypton was the home planet of Supergirl in the DC comics, hence why she is overjoyed in WC: Supergirl Meets E.T. when E.T. gives her a Kryptonian singing flower.