Thundercats 2011-2012 is currently the biggest disaster I have ever witnessed
The others are all movie based (see below my thoughts)
2. Dragonball Z the Movie
3. Tron Legacy
4. Avatar the movie by Mattel
I don't really consider movie toys as true disasters, they are budgeted to fail and most only ever sell on clearance. I was actually amazed MIB3 got a toy line approved, the 2nd movie just about killed the franchise and it has been dormant for years.