The Panopticon/Validity of the Titan's backup comic strips
Why exactly these humorous sketches considered valid? They're just little additions to the main stories, not at all like DWM backup comics, where some serious staff happened - the introduction of Abslom Daak and Kroton for instance.
Here we have just tongue-in-cheek stories with farcical scenarios, much like, well, everything from this category. Such as the adventures of the depressed Tenth Doctor and his Rose-the-Cat, first four Doctors forming a musical band, the Eleventh Doctor's account in social media and a bunch of old companions from different time zones just like that meeting up to chat about the Doctor. I mean, even the artwork screams of non-seriousness!
And when those things are referenced in the main articles, it's just ridiculous…
Falling into a depression, the Doctor spent some time sulking in The TARDIS; apparently making so few travels that vast spider-webs began to grow in the control room. He soon began to binge-watch emotional films, such as Love Actually, The Lion King, and Annie Hall, as he ate large quantities of ice cream. Still heartbroken over the loss of Rose Tyler, he adopted a cat which he gave her name.
Polly remained friends with the Doctor on Bookface. She liked some of the Eleventh Doctor's status updates. (COMIC: Timeliney Wimey)
The Doctor attempted to form a band with his second, third and fourth incarnations, but creative differences, and the fact that they all wanted to play the drums, broke them up. (COMIC: Day of the Tune)
