Danny (The Zentrabot Invasion)

Danny was a young boy who briefly travelled with the Eleventh Doctor.

Biography
Early on Christmas morning, Danny and his sister, Abby, snuck downstairs to see what presents they got. Danny got a new skateboard. The Eleventh Doctor arrived, warning them not to open the next box. The activation signal reached the Zentrabot inside the present, who broke out of the packaging and attacked. The Zentrabots kidnapped thousands of children across Earth, including Abby.

To save the children, the Doctor took the TARDIS to the Zentra mothership. Danny collided with a Zentrabot working on board, allowing the Doctor to reprogram it and subsequently reprogram other Zentrabots to turn on the Zentra guards.

The Doctor discovered the holding cell containing the children, reuniting Danny and Abby, and returned them all home. (COMIC: The Zentrabot Invasion)

Promising Abby and Danny's parents they'd be only away for five minutes, he took them away for another trip. Queen Shemura's image invaded the TARDIS' telepathic circuits. The signal was traced to a palace on the planet Philastra. After seeing Shemura project a fabricated invasion that had wiped out most of her people, the Doctor agreed to her plea to release her from suspended animation. When released, she revealed that she turned on her treacherous subjects and killed them.

Shemura took the TARDIS key and threw the Doctor, Danny and Abby in prison. With the help of the prisoner Alaban, the three escaped. Before Shemura could enter the TARDIS, the Doctor convinced her that only he could pilot it. The Doctor boosted the telepathic circuits, bringing the mental projections of the dead through. The mind control on Shemura's guards was blocked, and the Doctor locked Shemura back into stasis. The Doctor then realised Danny and Abby's parents might be wandering where they were. (COMIC: The Tomb of Shemura)

The Doctor claimed to have accidentally landed thirty years in Danny's future before Danny met him and he had twins that looked exactly like him. (COMIC: The Zentrabot Invasion)