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Dressed as Batman, the blink bassist played What's My Age Again?, The Rock Show and Family Reunion. And while Mark played through many of the pop-punks' songs live on Twitch during his cancer battle, this was his first time properly performing live since announcing that he was "cancer free"!
Elsewhere on the stream, Avril turned up to run through Sk8r Boi and Girlfriend. MGK, meanwhile, played papercuts, forget me too, WANNA BE (with jxdn), Sick And Tired (with iann dior), WWIII (twice) and jawbreaker.
Watch the blink portion of the House Of Horrors livestream below: