4 April

On 4 April 1963, Susan Foreman met with John Brent at the Lyons' Corner House; they had tea and cake, and Susan tried to explain "the Box" and her species. By this date, the six-year-old Malcolm's aunt Junie began living with him, cancelling the need for Susan's regular Saturday babysitting. Gillian Roberts and Zack began dating, hoping to get engaged by the following year. Meanwhile, the First Doctor discovered that he'd broken something serious in his TARDIS and set about fixing it. (PROSE: Time and Relative)

In the 1970s, Sarah Jane Smith's one-day pass for the National Institute for Advanced Scientific Research — better known as Think Tank — was dated 4 April. (TV: Robot)

In 1975, Marta Vanderburgh was born. (AUDIO: Life Experience)

In 2021, Maxie Masters of the Preternatural Research Bureau nearly died in an allergic reaction to the pollen of alien plants from Ogden Farm. Giles's attempt to cure her using a dose of the Cyberon drug led P.R.O.B.E. to uncover and defeat an actual Cyberon who had been buried underneath Clapham Junction for some time. (HOMEVID: The Only Cure)