Calc The Umbrella Academy - What if Dr Terminal saw the cockroach

Doctor Terminal devours a cockroach. To remind you of why this is impressive, any matter consumed by Doctor Terminal is turned into energy, which he uses to feed himself, and can be redirected as energy beams.
We are given a mass of 925mg (or 0.000925kg), so this will be very straight forward.

E = mc^2
= 0.000925 X 299792458^2
= 8.3134854e13 joules
= 19.869706978967496 kilotons

Final Results
Doctor Terminal devours a cockroach = 19.87 kilotons