Plotting surface with matrices

Consider the information:

a1 = [1 2 3 5 2]; a2 = [0 1 -1 4 2];

b1 = [- 5 0 2 7 8]; b2 = [- 2 -1 4 -2 5];

c1 = [1 2 8 9 12]; c2 = [1 2 8 9 12];

I need to make a surface with these values where a1 and a2 are at level 0 (e.g., in the z-axis they are in z = 0); the values of b1 and b2 are at level 0.5 (in the z-axis we have z=0.5) and the value c1 and c2 correspond to level 1 (height z = 1).

I did the graphic using the plot3 but I wanted a surface.

Thanks!

[JRC]

I did the graphic using the plot3 and it is varying on time discrete (time=1, 2, 3, 4 and 5).