Blecplam Two and a Half

 was a location where the Thirteenth Doctor, Yasmin Khan, Graham O'Brien and Ryan Sinclair watched sentient nebulae in 3912.

There they encountered Leon Perkins's hand sticking out of a portal.

The Doctor previously saw them in an earlier incarnation, (COMIC: A New Beginning) including briefly in their tenth, whereupon he quickly dematerialised after finding the Daleks right outside his TARDIS. (COMIC: Defender of the Daleks)