The passenger compartment of the Marvel R remained stable in the frontal offset test. Dummy numbers showed good protection of the knees and femurs of both the driver and passenger.  Structures in the dashboard were thought to present a risk of injury to occupant of different sizes and to those sitting in different positions, and protection of this body region was rated as marginal.  Protection of the driver’s chest was also rated as marginal, based on readings of chest compression.  Analysis of the deceleration of the impact trolley during the test, and analysis of the deformable barrier after the test, revealed that the Marvel R would be a moderately benign impact partner in a frontal collision. In the full width rigid barrier test, protection of all critical body regions was rated as good or adequate, except for the pelvis of the rear passenger.  During the test, the pelvis slipped under the lap section of the seatbelt – a phenomenon known as ‘submarining’.  The score for this body regions was penalised as a result, and protection rated as poor.  In the side barrier test, protection of all critical body regions was good and the Marvel R scored maximum points in this part of the assessment.  In the side barrier impact, measurements of rib deflection indicated weak chest protection but that of other parts of the body was good.  Limitation of occupant excursion - the extent to which the occupant is flung to the other side of the vehicle in a side impact - was rated as adequate. The Marvel R has a centre airbag as a counter-measure against occupant to occupant injuries in side impacts. In Euro NCAP’s test, the heads of the front seat occupants made contact and protection against such injuries was rated as poor.  Tests on the front seats and head restraints demonstrated good protection against whiplash injures in the event of a rear-end collision. However, a geometric assessment of the rear seats indicated poor whiplash protection. The Marvel R has an advanced eCall system to alert the emergency services in the event of a collision, and a braking system which helps to prevent secondary impacts.

In the frontal offset test, protection of all critical body areas was good for both dummies, except the neck of the 10 year old. Here, measurements of neck tension indicated poor protection.  The front passenger airbag can be disabled to allow a rearward-facing child restraint to be used in that seating position. MG do not recommend that Universal belt-mounted child restraints be used in the front passenger or the rear centre seat, and the rear centre position also failed Euro NCAP check for its suitability to accommodate such seats.  All child restraints for which the Marvel R is designed could be properly installed and accommodated in the rear outboard seats.

The protection offered by the bonnet to the head of a struck pedestrian was predominantly good or adequate. The bumper provided good protection to pedestrian's legs at all test positions. However, protection of the pelvis was por at all test locations. The Marvel R's autonomous emergency braking (AEB) system detects vulnerable road users like pedestrians and cyclists, as well as other vehicles. In tests of the system's response to such road-users, performance was rated as marginal, with collisions avoided or mitigated in some test scenarios.

The Marvel R’s autonomous emergency braking (AEB) system performed adequately in tests of its reaction to other vehicles, with impacts avoided in most cases. A seatbelt reminder system, including occupant detection, is standard for all seats and the Marvel R is also equipped with 'Unsteady Driving Warning’, which monitors steering inputs for patterns which are characteristic of a fatigued or inattentive driver. Lane assistance corrects the car's path if it is drifting out of lane and also intervenes in some more critical situations, and the system scored maximum points in Euro NCAP’s tests. The speed assistance system recognises local speed limits, allowing the speed limiter to be set appropriately.