Symbiote Invasion is a Tumblr event similar to the Pony Prom 2012, with a main Villain and a big story for everyone who partecipates. The main Villain has fused the majority of the tumblrpon dimensions creating some kind of "Shared Dimension" that is going to die soon because of the forced fusion of the dimensions. Every character from every different Tumblr can choose to help other characters to fight the main Antagonists and find out why they did this,or can choose to fight the environment, full of Symbiotes that tries to take over every creature they find.

More informations here http://symbiotes-invasion.tumblr.com/