Marvel Fusion is developing economically viable laser-based inertial fusion energy through advancements in laser technology, fuels, and fast-ignition concepts, aiming to deliver reliable, clean energy without long-lived radioactive waste. Founded in 2019, Marvel Fusion is an innovative fusion company in the field of laser-based inertial fusion energy. Marvel FusionMarvel Fusion (MF) is a fusion company investigating commercially viable routes to laser-based Inertial Fusion Energy (IFE). Marvel Fusion is also pioneering work on advanced cryogenic fuels with controlled contaminants as well as non-cryogenic fuel systems that offer potential advantages for commercial fusion energy. The role of fast ignitionAn important parameter in the context of laser-based IFE is the so-called target gain QT, defined as the ratio of fusion energy to the laser energy deposited in the target.