Overview
11-year-old Yusuke and his classmates camp in the woods and see a strange light. They discover a small metallic object like a robot which talks, calls himself Tetra and knows Yusuke's name. Tetra can create wonderful gadgets but actually has to save the world with Yusuke's help from extraterrestrials with bad intentions.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 23 | 48 | |
 | 22 | 47 | |
 | 13 | 38 | |
 | 13 | 38 | |
 | - | - | |
| 12 | 37 | |
 | 39 | 64 | |
 | 37 | 62 | |
 | 43 | 68 | |
 | 40 | 65 |