The Shopkeeper (Lost in Time)

The Shopkeeper was a self-described "servant of the universe". Along with his companion, a parrot called Captain, the mysterious Shopkeeper attracted Sarah Jane Smith to his shop in order for her, Clyde Langer and Rani Chandra to find three special objects for him to save time itself. He was capable of opening time windows, but was "forbidden" to travel through them himself.

Biography
In November 2010, the Shopkeeper, who refused to state his age, told the Ealing Echo that there was an alien in his shop. When Sarah Jane Smith, Clyde Langer and Rani Chandra saw the paper, they went to the Shopkeeper's shop. He revealed that it was a ploy to get them there to send them through a time window to a different time period for each of them, so they could find three special objects. Sarah Jane was sent to 1889, Clyde was sent to 7th June 1941 and Rani was sent to 19th May 1553. As he monitored their progress, he became increasingly anxious, noting to his parrot "Captain" that when the sand timer ran out they would be trapped in the past forever. When the sands expired, he tried to close the Time Window but it would not shut. If left open it would destroy the entire planet. He watched as Rani and Clyde obtained their objects and and returned. Sarah Jane returned empty-handed, but Angela Price, the granddaughter of Sarah Jane's companion in the past, gave her the final object and the Shopkeeper took it, and with the others closed the Time window. He then bid farewell to the Bannerman Road gang, saying Captain's work was done and he and the parrot teleported away. (SJA: Lost in Time)

In 2011, he returned to drop off a baby at Sarah Jane's house. This child was initially a weapon created by Miss Myers of the Fleshkind to destroy every single Metalkind in existence. The Shopkeeper felt that the child (named Sky Smith by Sarah Jane) would be safest with Sarah Jane. When the ordeal with Miss Myers was complete, he and the Captain appeared in Sarah Jane's attic to confirm it was him who dropped Sky off. He explained that it was his duty to "put things in there right places" and after Sky expressed the desire to stay with Sarah Jane, he and the Captain teleported away telling the former time-traveller she would find out exactly who he was in good time. (SJA: Sky)