The Flash (Wally West) is a very fast playable character in LEGO Batman 2: DC Super Heroes
He is mostly red and yellow, with a red helmet that has yellow lightning bolts instead of ears, and a yellow lightning bolt on his red shirt. His pants are red with yellow boots. In the game his only powers are super-jump and super-speed.
Wally West was obsessed with the present Flash, Barry Allen. He went to visit Barry in his lab, where Barry explained how an incorrect mixture of chemicals and an accident in the lab caused him to gain super-speed. Wally was messing around with chemicals, trying to get the same mixture, when he succeeded. Wally was taken under the mentoring of Barry Allen, training to control his powers and ultimately become the new Flash. In LEGO Batman 2: DC Super Heroes Flash rebuilds Wayne Tower with his super-speed, and is playable in the final level of the game.