Transformation: Fold back the panels on the rear of the outer sides of the hulls. Fold each hull out to the sides and fold back behind the boat. Fold the front of each hull back of the rear of each hull to form the robot's legs and fold down the feet. Fold the sides of the engine down to form the arms, swinging each chain gun forward 180 degrees. Fold the canopy down to form the chest plate.
In robot mode the grey/blue takes over as the primary colour with the black being confined to the legs. Nice head with a green dome covering the eyes and upper front of the head. Decent articulation: bending knees, hips that turn and fold to the sides, rotating head, ball jointed shoulders, bending upper elbows and ball jointed lower elbows. Fists are 5mm peg holes so no problem holding weapons mode here. Chain guns now swung out under the arms. A single minicon port is found on his chest. There's just something about this robot mode which isn't right. It's hard to explain but I think each leg looks like it should be on the other side! Just something about the lines and the details.
Transformation to torso mode: Pull the chest plate out, fold the shoulders forward and the power core connector blocks to the side. Pull the chest itself forward, then fold the head backwards into the robot's back folding the chest with it which locks onto what was the small robot's back. Bend the arm right back at each elbow, then swing the lower arm round the back of the upper arm. Fold up and place the 5mm fist hole over the shoulder post. Bend the legs out to the sides at the hips and then back down above the knees. Turn each lower leg round 180 degrees and fold down the Power Core Connector blocks from the legs. Unpeg the front of the legs and move it so it sits about 1cm further up the leg
Undertow's drone commander mode is dominated by the head - a gold painted old fashioned diver's helmet, similar to An Action Man Deep See Diver which was around when I was a child. The exposed panels on it are clear green plastic powered by a light pipe in the top of the head. Slung over his shoulders are the chain guns from vehicle mode. Unfortunately the rest of the toy is thin & skeletal, and this look isn't doing anything for me here. The shoulders turn as do the head and the hip while the knees bend.
Yeah it works as a toy. But I'm afraid that, apart from the combined robot mode head, there's little to excite me here. Sorry.