Shonter

The Shonters and the Wheeltuppers (two races of "hostile aliens") attacked Doctor Why's TARDIS while it was stationed on top of the Post Office Tower in London, forcing him to dematerialise once the attackers' presence was detected by the timeship's scanner. (NOTVALID: Hallo My Dalek)

Behind the scenes

 * Although the Shonters themselves were only ever mentioned in the wholly unserious Hallo My Dalek parody, the planet Shontaa later appeared as the setting of an earnest Fourth Doctor comic story, Rest and Re-Creation.