With a few lines of code, we can make this text scroll in the horizon, just as it does in the movie. Add the following C# script class, called ScrollZ, as a component of the Text-crawler GameObject:

using UnityEngine;
using System.Collections;

public class ScrollZ : MonoBehaviour
{
  // variable letting us change how fast we'll move text into the 'distance'
  public float scrollSpeed = 20;

  //-----------------
  void Update ()
  {
    // get current position of parent GameObject
    Vector3 pos = transform.position;

    // get vector pointing into the distance
    Vector3 localVectorUp = transform.TransformDirection(0,1,0);

    // move the text object into the distance to give our 3D scrolling effect
    pos += localVectorUp * scrollSpeed * Time.deltaTime;
    transform.position = pos;
  }
}

In each frame, via the Update() method, the position of the 3D text object is moved in the direction of this GameObject's local up direction...