Holo TV was a television network that broadcast a programme that involved the characters of Thyron and the Gherax in which the Seventh Doctor once unwittingly participated. The network was also known to transmit Galactic Hospital. (COMIC: A Switch in Time)
Behind the scenes
A Switch in Time does not make clear on which planet Holo TV broadcast, nor the name of the species that regularly enjoyed its programming. However, judging by two audience members seen at the end of the story, at least some of Holo TV's audience members weren't humanoid.