@Kitonum

For Your Interest, I used this code:

> restart:with(plots):with(plottools):
> a1:=spacecurve([cos(t),sin(t),t],t=0..4*Pi):
> display(a1);

However Mablecat's solution works

@mablecat 

That worked! Thank you!

Still curious why the curve doesn't show up without the option..