Feat happens in Season 1 Episode 18 of Ultimate Alien at 17:00.
Three Echo Echos contain a small explosion of a nuclear fusion grenade before it gets larger and too powerful for them to contain.
Calculation[]
The explosion the Echo Echos contain is the same explosion as the one here, just smaller, so I will be using the same method just using the temperature of a nuclear explosion instead.
Echo Echo - 77.3 px or 0.35 meters
Radius of the explosion - 107.08 px/2 = 53.54 px or 0.24 meters
Now we need the surface area of the sphere.
A = 4pi*r^2
A = 0.7238229473870884 m^2
Using the Stefan-Boltzmann Law of thermal radiation.
Temperature of a nuclear explosion - 10,000,000 degrees C.
q = sigma*T^4*A
q = (5.6703e-8) * (10000000)^4 * (0.7238229473870884)
q = 4.10429325856900735452e+20 Joules
Dividng by 3 as it took 3 Echo Echos to contain the explosion.
q = 1.36809775285633578484e+20 Joules or 32.7 Gigatons (Island level)
Final Tally[]
Echo Echo contains an explosion - 32.7 Gigatons (Island level)